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300-115 Implementing Cisco IP Switched Networks (SWITCH v2.0)

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300-115 exam Dumps Source : Implementing Cisco IP Switched Networks (SWITCH v2.0)

Test Code : 300-115
Test denomination : Implementing Cisco IP Switched Networks (SWITCH v2.0)
Vendor denomination : Cisco
free pdf : 332 true Questions

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Cisco Implementing Cisco IP Switched

Cisco (300-a hundred and fifteen): enforcing Cisco IP Switched Networks | killexams.com true Questions and Pass4sure dumps

The enforcing Cisco IP Switched Networks (switch 300-a hundred and fifteen) examination is supposititious for candidates who requisite to certify their switching talents and expertise. Candidates may still live in a position to plan, configure, and examine the implementation of complex commercial enterprise Cisco switching options that utilize the Cisco commercial enterprise Campus architecture.

enforcing Cisco IP Switched Networks (change 300-one hundred fifteen) is required for Cisco’s CCNP Routing and Switching and CCDP certifications.

This examine incorporates 174 questions and covers the following objectives:

  • Layer 2 applied sciences – 115 questions
  • Infrastructure safety – 38 questions
  • Infrastructure services – 20 questions
  • This verify includes references to the following media:

  • CCNP Routing and switching ROUTE 300-a hundred and fifteen legit Cert e-book
  • net aid
  • Cisco.com
  • CiscoPress.com

  • implementing Cisco IP Switched Networks (switch) groundwork studying e book: community Design Fundamentals | killexams.com true Questions and Pass4sure dumps

    This chapter from imposing Cisco IP Switched Networks (swap) basis getting to know book: (CCNP switch 300-one hundred fifteen) begins the journey of exploring campus community design fundamentals by means of specializing in a yoke of core ideas round community design and structure and just a few particulars in regards to the architecture of Cisco switches. This chapter is from the engage 

    every time you fade to an office to drudgery or fade to classification in school, college, or college, you'll utilize a campus community to access crucial purposes, equipment, the internet, etc over wired or instant connections. commonly, you may additionally even gain access through the utilize of a portable gadget comparable to an Apple iPhone connected on a corporate Wi-Fi to achieve purposes reminiscent of electronic mail, calendaring, or quick messaging over a campus network. therefore, the men and women chargeable for constructing this community should installation sound fundamentals and design concepts for the campus networks to office appropriately and supply the integral balance, scalability, and resiliency captious to maintain interconnectivity with a one hundred percent uptime.

    This chapter begins the experience of exploring campus network design fundamentals with the aid of focusing on just a few core ideas round network design and structure and just a few details about the structure of Cisco switches. here's valuable potential when designing and pile campus networks. exceptionally, this chapter focuses on right here two high-stage themes:

  • Campus community structure
  • Introduction to Cisco switches and their linked architecture
  • A campus community describes the ingredient of an commercial enterprise infrastructure that interconnects discontinuance gadgets comparable to computers, laptops, and wireless entry points to capabilities akin to intranet materials or the internet. Intranet substances may live business net pages, denomination seat functions, file and print capabilities, and well-nigh the repose discontinuance users hook up with from their desktop.

    In several phrases, the campus network offers for connectivity to enterprise purposes and tools that reside in a data seat for conclusion users. at the beginning, earlier than round 2005, the time era campus network and its architectures Have been captious for software server farms and computing infrastructure as smartly. today, the infrastructure that interconnects server farms, application servers, and computing nodes are evidently individual from campus networks and referred to as facts centers.

    over the past few years, statistics seat architectures Have eddy into more advanced and require sophistication now not required in the campus community as a result of excessive-availability, low-latency, and excessive-efficiency necessities. hence, data centers may additionally utilize bleeding-area applied sciences that are not organize in the campus network, akin to FabricPath, VXLAN, and application Centric Infrastructure (ACI). For the purpose of CCNP switch at the time of this writing, these applied sciences, as well as information middle architectures, are out of scope. in spite of this, they will ingredient out some of the transformations as to steer pellucid of any confusion with campus network fundamentals.

    The next subsection describes the hierarchical community design with right here subsections breaking down the components of the hierarchical design in detail.

    Hierarchical network Design

    A flat enterprise campus community is the region any PCs, servers, and printers are connected to every other the utilize of Layer 2 switches. A flat community doesn't utilize subnets for any design purposes. furthermore, any instruments on this subnet are within the identical broadcast domain, and publicizes will live flooded to any attached community gadgets. as a result of a broadcast packet received by route of an conclusion gadget, equivalent to pill or laptop, makes utilize of compute and that i/O components, pronounces will squander obtainable bandwidth and components. In a community measurement of ten instruments on the same flat community, this is now not a major problem; besides the fact that children, in a community of heaps of instruments, this is a significant squander of resources and bandwidth (see device 2-1).

    Figure 2-1

    determine 2-1 Flat Versus Hierarchical community Design

    on account of these broadcast issues and many other boundaries, flat networks don't scale to fulfill the wants of most business networks or of many miniature and medium-size corporations. To tackle the sizing needs of most campus networks, a hierarchical model is used. device 2-2 illustrates, at a tall level, a hierarchical view of campus network design versus a flat community.

    Hierarchical models for network design will let you design any networks in layers. To live sensible the moment of layering, accept as just with the OSI reference model, which is a layered mannequin for figuring out and imposing laptop communications. by using layers, the OSI model simplifies the job it's required for two computers to communicate. Leveraging the hierarchical mannequin likewise simplifies campus network design by means of allowing focus at distinctive layers that construct on each different.

    regarding device 2-2, the layers of the hierarchical model are divided into particular features categorized as core, distribution, and access layers. This categorization offers for modular and springy design, with the potential to develop and scale the design devoid of significant modifications or reworks.

    as an example, adding a brand recent wing to your office constructing may well live so simple as including a recent distribution layer with an access layer whereas including means to the core layer. The current design will remain intact, and simplest the additions are obligatory. other than the basic actual additions, configuration of the switches and routes is relatively simple because many of the configuration concepts around hierarchy had been in region any the route through the household design.

    through definition, the access, distribution, and core layer adhere to right here traits:

  • access layer: The entry layer is used to concede the user entry to network applications and functions. In a campus community, the entry layer commonly incorporates switched LAN devices with ports that deliver connectivity to workstations, IP telephones, access elements, and printers. In a WAN ambiance, the access layer for teleworkers or far flung sites may likewise deliver access to the company network throughout WAN applied sciences.
  • Distribution layer: The distribution layer aggregates the access layer switches wiring closets, floors, or different actual district by using leveraging module or Layer three switches. in a similar way, a distribution layer can likewise compund the WAN connections at the edge of the campus and provides coverage-based mostly connectivity.
  • Core layer (also known as the spine): The core layer is a high-pace spine, which is designed to switch packets as quickly as possible. In most campus networks, the core layer has routing capabilities, which can live mentioned in later chapters of this booklet. since the core is captious for connectivity, it ought to give a exorbitant degree of availability and adjust to changes quickly. It likewise offers for dynamic scalability to accommodate boom and quickly convergence within the event of a failure.
  • The subsequent subsections of this chapter characterize the access layer, distribution layer, and core layer in more detail.

    entry Layer

    The entry layer, as illustrated in determine 2-three, describes the logical grouping of the switches that interconnect conclusion instruments akin to PCs, printers, cameras, and the like. it's additionally the location where devices that extend the network out an extra stage are connected. Two such prime examples are IP telephones and wireless APs, both of which prolong the connectivity out one other layer from the specific campus access change.

    The wide diversity of possible styles of instruments that may connect and the quite a lot of functions and dynamic configuration mechanisms which are captious build the access layer one of the most equipped ingredients of the campus network. These capabilities are as follows:

  • excessive availability: The access layer supports tall availability by means of default gateway redundancy the usage of twin connections from entry switches to redundant distribution layer switches when there isn't any routing in the access layer. This mechanism in the back of default gateway redundancy is known as first-hop redundancy protocol (FHRP). FHRP is mentioned in more detail in later chapters of this e-book.
  • Convergence: The access layer commonly supports inline vigour over Ethernet (PoE) for IP telephony, thin shoppers, and instant entry facets (APs). PoE makes it possible for shoppers to conveniently region IP telephones and instant APs in strategic places with out the deserve to race power. in addition, the access layers allow assist for converged aspects that allow highest character software configuration of IP phones and wireless APs, as neatly. These elements are discussed in later chapters.
  • security: The entry layer likewise offers capabilities for further safety towards unauthorized access to the community through the utilize of tools reminiscent of port protection, pleasant of carrier (QoS), Dynamic Host Configuration Protocol (DHCP) snooping, dynamic ARP inspection (DAI), and IP source preserve. These security features are mentioned in additional detail in later chapters of this book.
  • The next subsection discusses the upstream layer from the entry layer, the distribution layer.

    Distribution Layer

    The distribution layer within the campus design has a different role wherein it acts as a functions and manage border between the entry layer and the core. both the entry layer and the core are just about dedicated particular-aim layers. The entry layer is committed to assembly the services of end-equipment connectivity, and the core layer is committed to proposing nonstop connectivity throughout the entire campus network. The distribution layer, in contrast, serves numerous applications. determine 2-4 references the distribution layer.

    Availability, quick route recuperation, load balancing, and QoS are any vital concerns at the distribution layer. often, exorbitant availability is provided via Layer three redundant paths from the distribution layer to the core, and either Layer 2 or Layer three redundant paths from the entry layer to the distribution layer. withhold in mind that Layer 3 equal-cost load sharing makes it possible for each uplinks from the distribution to the core layer for utilize for site visitors in a lot of load-balancing strategies mentioned later during this chapter.

    With a Layer 2 design in the access layer, the distribution layer generally serves as a routing border between the entry and core layer with the aid of terminating VLANs. The distribution layer often represents a redistribution ingredient between routing domains or the demarcation between static and dynamic routing protocols. The distribution layer may likewise effect tasks such as controlled routing altenative making and filtering to set aside in coerce policy-primarily based connectivity, security, and QoS. These points allow for tighter wield of site visitors through the campus community.

    To augment routing protocol performance further, the distribution layer is generally designed to summarize routes from the access layer. If Layer 3 routing is prolonged to the access layer, the distribution layer generally offers a default route to entry layer switching while leveraging dynamic routing protocols when communicating with core routers.

    furthermore, the distribution layer optionally gives default gateway redundancy through the utilize of a primary-hop routing protocol (FHRP) equivalent to Host Standby Routing Protocol (HSRP), Gateway Load Balancing Protocol (GLBP), or virtual Router Redundancy Protocol (VRRP). FHRPs provide redundancy and exorbitant availability for the first-hop default gateway of contraptions related downstream on the access layer. In designs that leverage Layer 3 routing within the entry layer, FHRP might not live relevant or may additionally require a unique design.

    In abstract, the distribution layer performs here features when Layer three routing isn't configured within the entry layer:

  • offers exorbitant availability and equal-charge load sharing by means of interconnecting the core and access layer by means of as a minimum twin paths
  • frequently terminates a Layer 2 district of a VLAN
  • Routes site visitors from terminated VLANs to different VLANs and to the core
  • Summarizes entry layer routes
  • Implements policy-based mostly connectivity such as traffic filtering, QoS, and security
  • gives for an FHRP
  • Core Layer (spine)

    The core layer, as illustrated in determine 2-5, is the spine for campus connectivity, and is the aggregation factor for the other layers and modules of an enterprise network. The core ought to give a exorbitant degree of redundancy and adjust to alterations right now.

    From a design point-of-view, the campus core is in many ways the simplest yet most captious a partake of the campus. It provides a confined set of capabilities and is designed to live particularly purchasable and requires 100 percent uptime. In big businesses, the core of the community should office as a nonstop, always-obtainable service. the key design aims for the campus core are in keeping with featuring the applicable degree of redundancy to enable for close-instant facts-movement restoration in the adventure of the failure of any component (swap, supervisor, line card, or fiber interconnect, energy, and the like). The network design must additionally let the occasional, but critical, hardware and application upgrade or change to live made devoid of disrupting any community applications. The core of the community should still now not set aside in coerce any complex policy capabilities, nor should still it Have any without detain connected consumer or server connections. The core should likewise Have the minimal control aircraft configuration it's combined with enormously obtainable devices which are configured with the proper quantity of actual redundancy to supply for this nonstop provider ability. device 2-6 illustrates a immense campus community interconnected through the core layer (campus backbone) to the statistics middle.

    From an enterprise architecture point-of-view, the campus core is the spine that binds together any of the points of the campus architecture to encompass the WAN, the facts core, etc. In different words, the core layer is the a partake of the community that offers for connectivity between discontinuance devices, computing, and data storage features that can live organize in the statistics middle, in addition to different areas and services in the network.

    determine 2-7 illustrates an instance of the core layer interconnected with different components of the business community. in this instance, the core layer interconnects with a data seat and edge distribution module to interconnect WAN, far off access, and the information superhighway. The network module operates out of company from the community however remains a crucial element.

    Figure 2-7

    figure 2-7 Core Layer Interconnecting with the enterprise network

    In abstract, the core layer is described as follows:

  • Aggregates the campus networks and gives interconnectivity to the facts core, the WAN, and different remote networks
  • Requires tall availability, resiliency, and the capacity to build utility and hardware upgrades devoid of interruption
  • Designed devoid of direct connectivity to servers, PCs, entry elements, etc
  • Requires core routing means
  • Architected for future growth and scalability
  • Leverages Cisco structures that support hardware redundancy such as the yeast 4500 and the yeast 6800
  • Layer three within the entry Layer

    As switch products develop into extra commoditized, the cost of Layer three switches has diminished enormously. as a result of the reduced can freight and a number of inherit benefits, Layer 3 switching within the entry layer has become extra customary over regular Layer 2 switching within the entry layer. using Layer three switching or common Layer 2 switching in the access layer has advantages and downsides. determine 2-8 illustrates the evaluation of Layer 2 from the access layer to the distribution layer with Layer 3 from the entry layer to the distribution layer.

    As mentioned in later chapters, deploying a Layer 2 switching design within the access layer may discontinuance up in suboptimal usage of hyperlinks between the entry and distribution layer. moreover, this components does not scale as smartly in very colossal numbers as a result of the dimension of the Layer 2 area.

    the utilize of a design that leverages Layer 3 switching to the access layer VLANs scales better than Layer 2 switching designs as a result of VLANs snare terminated on the access layer contraptions. particularly, the hyperlinks between the distribution and access layer switches are routed links; any access and distribution instruments would participate within the routing scheme.

    The Layer 2-handiest access design is a traditional, a slight cheaper solution, however it suffers from most efficient utilize of hyperlinks between entry and distribution due to spanning tree. Layer three designs interpose the problem of how to sunder traffic. (for example, guest traffic should reside separated from intranet site visitors.) Layer three designs additionally require cautious planning with admire to IP addressing. A VLAN on one Layer 3 entry machine can't live on yet another entry layer change in a several partake of your network as a result of every VLAN is globally giant. traditionally, mobility of contraptions is proscribed in the campus network of the enterprise in Layer three access layer networks. without using an advanced mobility networking aspects.

    In summary, campus networks with Layer three within the entry layer are getting greater regularly occurring. additionally, subsequent-technology architectures will alleviate the biggest problem with Layer 3 routing within the entry layer: mobility.

    The subsequent subsection of this chapter applies the hierarchical mannequin to an business architecture.

    The Cisco business Campus architecture

    The Cisco commercial enterprise campus architecture refers back to the household hierarchical campus network applied to the network design, as illustrated in device 2-9.

    The Cisco enterprise campus architecture divides the enterprise community into actual, logical, and practical areas while leveraging the hierarchical design. These areas enable community designers and engineers to associate certain community functionality on device that's in keeping with its placement and office in the model.

    note that besides the fact that children the tiers finish Have particular roles within the design, no absolute guidelines practice to how a campus network is physically constructed. although it is right that many campus networks are constructed through three actual tiers of switches, here's now not a strict requirement. In a smaller campus, the network might Have two tiers of switches through which the core and distribution elements are combined in one physical swap: a collapsed distribution and core. despite the fact, a community may additionally Have four or more physical tiers of switches since the scale, wiring plant, or physical geography of the network may require that the core live prolonged.

    The hierarchy of the network often defines the actual topology of the switches, however they are not the same element. the significant thing principle of the hierarchical design is that every point in the hierarchy has a specific set of functions and functions that it offers and a selected office to play within the design.

    In reference to CCNP swap, the access layer, the distribution layer, and core layer could live stated because the pile entry layer, the pile distribution layer, and the constructing core layer. The term constructing implies however doesn't restrict the context of layers as physical structures. As outlined previously, the actual demarcation does not should live a building; it can likewise live a floor, group of floors, wiring closets, and so forth. This e-book will fully utilize the phrases access layer, distribution layer, and core layer for simplicity.

    In abstract, community architects construct Cisco business campus networks via leveraging the hierarchical mannequin and dividing the layers through some physical or logical barrier. although campus network designs fade a lot extra beyond the fundamental constitution, the significant thing takeaway of this partake is that the entry, distribution, and core layers are utilized to both actual or logical limitations.

    The requisite for a Core Layer

    When first getting to know campus network design, persons often query the requisite for a core layer. In a campus network contained with a number of buildings or the same physical infrastructure, collapsing the core into the distribution layer switches may additionally withhold on prefatory freight because a whole layer of switches isn't essential. determine 2-10 shows a network design illustration where the core layer has been collapsed into the distribution layer by using totally meshing the four diverse physical structures.

    regardless of a likely lessen cost to the initial build, this design is intricate to scale. additionally, cabling necessities boost dramatically with each and every recent constructing as a result of the want for full-mesh connectivity to any of the distribution switches. The routing complexity likewise increases as recent structures are delivered because additional routing friends are crucial.

    with regard to device 2-10, the distribution module in the 2nd constructing of two interconnected switches requires four extra links for full-mesh connectivity to the first module. a 3rd distribution module to support the third constructing would require 8 additional hyperlinks to aid the connections to any the distribution switches, or a total of 12 hyperlinks. A fourth module supporting the fourth constructing would require 12 recent hyperlinks for a total of 24 hyperlinks between the distribution switches.

    As illustrated in device 2-eleven, having a committed core layer enables the campus to accommodate growth devoid of requiring full-mesh connectivity between the distribution layers. this is certainly significant as the size of the campus grows both in variety of distribution blocks, geographical area, or complexity. In a bigger, greater advanced campus, the core provides the competence and scaling potential for the campus as a whole and can condominium additional services reminiscent of safety aspects.

    The question of when a sunder physical core is essential is relative upon distinctive elements. The potential of a certain core to permit the campus network to pellucid up physical design challenges is critical. youngsters, remember that a key goal of getting a several campus core is to deliver scalability and to minimize the risk from (and simplify) strikes, adds, and adjustments within the campus community. In common, a community that requires activities configuration changes to the core contraptions does not yet Have the applicable diploma of design modularization. as the network increases in size or complexity and changes start to impress the core gadgets, it commonly features out design factors for bodily isolating the core and distribution features into diverse physical instruments.

    In quick, however design networks without a core layer may additionally drudgery at miniature scale, medium-sized to enterprise-sized networks, they require a core layer for design modularization and scalability.

    In conclusion of the hierarchical mannequin offered in this part, regardless of its age, the hierarchical model is still significant to campus network designs. For overview, the layers are described as follows:

  • The entry layer connects conclusion gadgets akin to PCs, entry points, printers, and so forth to the network.
  • The distribution layer has diverse roles, however basically aggregates the multiple entry layers. The distribution may additionally terminate VLANs in Layer 2 to the access layer designs or deliver routing downstream to the entry layer with Layer three to the access layer designs.
  • The subsequent section delves into an significant constructing obstruct of the campus community: the Cisco change itself.


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    300-115 Implementing Cisco IP Switched Networks (SWITCH v2.0)

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    300-115 exam Dumps Source : Implementing Cisco IP Switched Networks (SWITCH v2.0)

    Test Code : 300-115
    Test denomination : Implementing Cisco IP Switched Networks (SWITCH v2.0)
    Vendor denomination : Cisco
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    Implementing Cisco IP Switched Networks (SWITCH v2.0)

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    This chapter from Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide: (CCNP SWITCH 300-115) begins the journey of exploring campus network design fundamentals by focusing on a few core concepts around network design and structure and a few details about the architecture of Cisco switches. This chapter is from the engage 

    Every time you fade to an office to drudgery or fade to class at school, college, or university, you will utilize a campus network to access captious applications, tools, the Internet, and so on over wired or wireless connections. Often, you may even gain access by using a portable device such as an Apple iPhone connected on a corporate Wi-Fi to achieve applications such as e-mail, calendaring, or instant messaging over a campus network. Therefore, the persons accountable for pile this network requisite to deploy sound fundamentals and design principles for the campus networks to office adequately and provide the necessary stability, scalability, and resiliency necessary to sustain interconnectivity with a 100 percent uptime.

    This chapter begins the journey of exploring campus network design fundamentals by focusing on a few core concepts around network design and structure and a few details about the architecture of Cisco switches. This is useful information when designing and pile campus networks. Specifically, this chapter focuses on the following two high-level topics:

  • Campus network structure
  • Introduction to Cisco switches and their associated architecture
  • A campus network describes the portion of an enterprise infrastructure that interconnects discontinuance devices such as computers, laptops, and wireless access points to services such as intranet resources or the Internet. Intranet resources may live company web pages, summon seat applications, file and print services, and almost anything discontinuance users connect to from their computer.

    In different terms, the campus network provides for connectivity to company applications and tools that reside in a data seat for discontinuance users. Originally, prior to around 2005, the term campus network and its architectures were relevant for application server farms and computing infrastructure as well. Today, the infrastructure that interconnects server farms, application servers, and computing nodes are clearly distinguished from campus networks and referred to as data centers.

    Over the past few years, data seat architectures Have become more complex and require sophistication not required in the campus network due to high-availability, low-latency, and high-performance requirements. Therefore, data centers may utilize bleeding-edge technologies that are not organize in the campus network, such as FabricPath, VXLAN, and Application Centric Infrastructure (ACI). For the purpose of CCNP Switch at the time of this writing, these technologies, as well as data seat architectures, are out of scope. Nevertheless, they will point out some of the differences as to avoid any confusion with campus network fundamentals.

    The next subsection describes the hierarchical network design with the following subsections breaking down the components of the hierarchical design in detail.

    Hierarchical Network Design

    A flat enterprise campus network is where any PCs, servers, and printers are connected to each other using Layer 2 switches. A flat network does not utilize subnets for any design purposes. In addition, any devices on this subnet are in the same broadcast domain, and broadcasts will live flooded to any attached network devices. Because a broadcast packet received by an discontinuance device, such as tablet or PC, uses compute and I/O resources, broadcasts will squander available bandwidth and resources. In a network size of ten devices on the same flat network, this is not a significant issue; however, in a network of thousands of devices, this is a significant squander of resources and bandwidth (see device 2-1).

    Figure 2-1

    Figure 2-1 Flat Versus Hierarchical Network Design

    As a result of these broadcast issues and many other limitations, flat networks finish not scale to meet the needs of most enterprise networks or of many miniature and medium-size businesses. To address the sizing needs of most campus networks, a hierarchical model is used. device 2-2 illustrates, at a tall level, a hierarchical view of campus network design versus a flat network.

    Hierarchical models for network design allow you to design any networks in layers. To understand the moment of layering, account the OSI reference model, which is a layered model for understanding and implementing computer communications. By using layers, the OSI model simplifies the job that is required for two computers to communicate. Leveraging the hierarchical model likewise simplifies campus network design by allowing focus at different layers that build on each other.

    Referring to device 2-2, the layers of the hierarchical model are divided into specific functions categorized as core, distribution, and access layers. This categorization provides for modular and springy design, with the competence to grow and scale the design without major modifications or reworks.

    For example, adding a recent wing to your office pile may live as simple as adding a recent distribution layer with an access layer while adding capacity to the core layer. The existing design will remain intact, and only the additions are needed. Aside from the simple physical additions, configuration of the switches and routes is relatively simple because most of the configuration principles around hierarchy were in region during the original design.

    By definition, the access, distribution, and core layer adhere to the following characteristics:

  • Access layer: The access layer is used to concede the user access to network applications and functions. In a campus network, the access layer generally incorporates switched LAN devices with ports that provide connectivity to workstations, IP phones, access points, and printers. In a WAN environment, the access layer for teleworkers or remote sites may provide access to the corporate network across WAN technologies.
  • Distribution layer: The distribution layer aggregates the access layer switches wiring closets, floors, or other physical domain by leveraging module or Layer 3 switches. Similarly, a distribution layer may aggregate the WAN connections at the edge of the campus and provides policy-based connectivity.
  • Core layer (also referred to as the backbone): The core layer is a high-speed backbone, which is designed to switch packets as rapid as possible. In most campus networks, the core layer has routing capabilities, which are discussed in later chapters of this book. Because the core is captious for connectivity, it must provide a tall smooth of availability and adjust to changes quickly. It likewise provides for dynamic scalability to accommodate growth and rapid convergence in the event of a failure.
  • The next subsections of this chapter characterize the access layer, distribution layer, and core layer in more detail.

    Access Layer

    The access layer, as illustrated in device 2-3, describes the logical grouping of the switches that interconnect discontinuance devices such as PCs, printers, cameras, and so on. It is likewise the region where devices that extend the network out one more smooth are attached. Two such prime examples are IP phones and wireless APs, both of which extend the connectivity out one more layer from the actual campus access switch.

    The wide variety of possible types of devices that can connect and the various services and dynamic configuration mechanisms that are necessary build the access layer one of the most capable parts of the campus network. These capabilities are as follows:

  • High availability: The access layer supports tall availability via default gateway redundancy using dual connections from access switches to redundant distribution layer switches when there is no routing in the access layer. This mechanism behind default gateway redundancy is referred to as first-hop redundancy protocol (FHRP). FHRP is discussed in more detail in later chapters of this book.
  • Convergence: The access layer generally supports inline Power over Ethernet (PoE) for IP telephony, thin clients, and wireless access points (APs). PoE allows customers to easily region IP phones and wireless APs in strategic locations without the requisite to race power. In addition, the access layers allow support for converged features that enable optimal software configuration of IP phones and wireless APs, as well. These features are discussed in later chapters.
  • Security: The access layer likewise provides services for additional security against unauthorized access to the network by using tools such as port security, character of service (QoS), Dynamic Host Configuration Protocol (DHCP) snooping, dynamic ARP inspection (DAI), and IP Source Guard. These security features are discussed in more detail in later chapters of this book.
  • The next subsection discusses the upstream layer from the access layer, the distribution layer.

    Distribution Layer

    The distribution layer in the campus design has a unique role in which it acts as a services and control border between the access layer and the core. Both the access layer and the core are essentially dedicated special-purpose layers. The access layer is dedicated to meeting the functions of end-device connectivity, and the core layer is dedicated to providing nonstop connectivity across the entire campus network. The distribution layer, in contrast, serves multiple purposes. device 2-4 references the distribution layer.

    Availability, rapid path recovery, load balancing, and QoS are any significant considerations at the distribution layer. Generally, tall availability is provided through Layer 3 redundant paths from the distribution layer to the core, and either Layer 2 or Layer 3 redundant paths from the access layer to the distribution layer. withhold in mind that Layer 3 equal-cost load sharing allows both uplinks from the distribution to the core layer to live used for traffic in a variety of load-balancing methods discussed later in this chapter.

    With a Layer 2 design in the access layer, the distribution layer generally serves as a routing border between the access and core layer by terminating VLANs. The distribution layer often represents a redistribution point between routing domains or the demarcation between static and dynamic routing protocols. The distribution layer may effect tasks such as controlled routing conclusion making and filtering to implement policy-based connectivity, security, and QoS. These features allow for tighter control of traffic through the campus network.

    To improve routing protocol performance further, the distribution layer is generally designed to summarize routes from the access layer. If Layer 3 routing is extended to the access layer, the distribution layer generally offers a default route to access layer switching while leveraging dynamic routing protocols when communicating with core routers.

    In addition, the distribution layer optionally provides default gateway redundancy by using a first-hop routing protocol (FHRP) such as Host Standby Routing Protocol (HSRP), Gateway Load Balancing Protocol (GLBP), or Virtual Router Redundancy Protocol (VRRP). FHRPs provide redundancy and tall availability for the first-hop default gateway of devices connected downstream on the access layer. In designs that leverage Layer 3 routing in the access layer, FHRP might not live applicable or may require a different design.

    In summary, the distribution layer performs the following functions when Layer 3 routing is not configured in the access layer:

  • Provides tall availability and equal-cost load sharing by interconnecting the core and access layer via at least dual paths
  • Generally terminates a Layer 2 domain of a VLAN
  • Routes traffic from terminated VLANs to other VLANs and to the core
  • Summarizes access layer routes
  • Implements policy-based connectivity such as traffic filtering, QoS, and security
  • Provides for an FHRP
  • Core Layer (Backbone)

    The core layer, as illustrated in device 2-5, is the backbone for campus connectivity, and is the aggregation point for the other layers and modules of an enterprise network. The core must provide a tall smooth of redundancy and adjust to changes quickly.

    From a design point-of-view, the campus core is in some ways the simplest yet most captious partake of the campus. It provides a limited set of services and is designed to live highly available and requires 100 percent uptime. In big enterprises, the core of the network must operate as a nonstop, always-available service. The key design objectives for the campus core are based on providing the usurp smooth of redundancy to allow for near-immediate data-flow recovery in the event of the failure of any component (switch, supervisor, line card, or fiber interconnect, power, and so on). The network design must likewise permit the occasional, but necessary, hardware and software upgrade or change to live made without disrupting any network applications. The core of the network should not implement any complex policy services, nor should it Have any directly attached user or server connections. The core should likewise Have the minimal control plane configuration that is combined with highly available devices that are configured with the redress amount of physical redundancy to provide for this nonstop service capability. device 2-6 illustrates a big campus network interconnected by the core layer (campus backbone) to the data center.

    From an enterprise architecture point-of-view, the campus core is the backbone that binds together any the elements of the campus architecture to involve the WAN, the data center, and so on. In other words, the core layer is the partake of the network that provides for connectivity between discontinuance devices, computing, and data storage services that are located within the data center, in addition to other areas and services within the network.

    Figure 2-7 illustrates an specimen of the core layer interconnected with other parts of the enterprise network. In this example, the core layer interconnects with a data seat and edge distribution module to interconnect WAN, remote access, and the Internet. The network module operates out of company from the network but is still a captious component.

    Figure 2-7

    Figure 2-7 Core Layer Interconnecting with the Enterprise Network

    In summary, the core layer is described as follows:

  • Aggregates the campus networks and provides interconnectivity to the data center, the WAN, and other remote networks
  • Requires tall availability, resiliency, and the competence to build software and hardware upgrades without interruption
  • Designed without direct connectivity to servers, PCs, access points, and so on
  • Requires core routing capability
  • Architected for future growth and scalability
  • Leverages Cisco platforms that support hardware redundancy such as the yeast 4500 and the yeast 6800
  • Layer 3 in the Access Layer

    As switch products become more commoditized, the cost of Layer 3 switches has diminished significantly. Because of the reduced cost and a few inherit benefits, Layer 3 switching in the access layer has become more common over typical Layer 2 switching in the access layer. Using Layer 3 switching or traditional Layer 2 switching in the access layer has benefits and drawbacks. device 2-8 illustrates the comparison of Layer 2 from the access layer to the distribution layer with Layer 3 from the access layer to the distribution layer.

    As discussed in later chapters, deploying a Layer 2 switching design in the access layer may result in suboptimal usage of links between the access and distribution layer. In addition, this system does not scale as well in very big numbers because of the size of the Layer 2 domain.

    Using a design that leverages Layer 3 switching to the access layer VLANs scales better than Layer 2 switching designs because VLANs snare terminated on the access layer devices. Specifically, the links between the distribution and access layer switches are routed links; any access and distribution devices would participate in the routing scheme.

    The Layer 2-only access design is a traditional, slightly cheaper solution, but it suffers from optimal utilize of links between access and distribution due to spanning tree. Layer 3 designs interpose the challenge of how to sunder traffic. (For example, guest traffic should remain separated from intranet traffic.) Layer 3 designs likewise require mindful planning with respect to IP addressing. A VLAN on one Layer 3 access device cannot live on another access layer switch in a different partake of your network because each VLAN is globally significant. Traditionally, mobility of devices is limited in the campus network of the enterprise in Layer 3 access layer networks. without using an advanced mobility networking features.

    In summary, campus networks with Layer 3 in the access layer are becoming more popular. Moreover, next-generation architectures will alleviate the biggest problem with Layer 3 routing in the access layer: mobility.

    The next subsection of this chapter applies the hierarchical model to an enterprise architecture.

    The Cisco Enterprise Campus Architecture

    The Cisco enterprise campus architecture refers to the traditional hierarchical campus network applied to the network design, as illustrated in device 2-9.

    The Cisco enterprise campus architecture divides the enterprise network into physical, logical, and functional areas while leveraging the hierarchical design. These areas allow network designers and engineers to associate specific network functionality on rig that is based on its placement and office in the model.

    Note that although the tiers finish Have specific roles in the design, no absolute rules apply to how a campus network is physically built. Although it is just that many campus networks are constructed by three physical tiers of switches, this is not a strict requirement. In a smaller campus, the network might Have two tiers of switches in which the core and distribution elements are combined in one physical switch: a collapsed distribution and core. However, a network may Have four or more physical tiers of switches because the scale, wiring plant, or physical geography of the network might require that the core live extended.

    The hierarchy of the network often defines the physical topology of the switches, but they are not the same thing. The key principle of the hierarchical design is that each ingredient in the hierarchy has a specific set of functions and services that it offers and a specific role to play in the design.

    In reference to CCNP Switch, the access layer, the distribution layer, and core layer may live referred to as the pile access layer, the pile distribution layer, and the pile core layer. The term pile implies but does not limit the context of layers as physical buildings. As mentioned previously, the physical demarcation does not Have to live a building; it can live a floor, group of floors, wiring closets, and so on. This engage will solely utilize the terms access layer, distribution layer, and core layer for simplicity.

    In summary, network architects build Cisco enterprise campus networks by leveraging the hierarchical model and dividing the layers by some physical or logical barrier. Although campus network designs fade much further beyond the basic structure, the key takeaway of this section is that the access, distribution, and core layers are applied to either physical or logical barriers.

    The requisite for a Core Layer

    When first studying campus network design, persons often question the requisite for a core layer. In a campus network contained with a few buildings or a similar physical infrastructure, collapsing the core into the distribution layer switches may save on initial cost because an entire layer of switches is not needed. device 2-10 shows a network design specimen where the core layer has been collapsed into the distribution layer by fully meshing the four several physical buildings.

    Despite a possible lower cost to the initial build, this design is difficult to scale. In addition, cabling requirements augment dramatically with each recent pile because of the requisite for full-mesh connectivity to any the distribution switches. The routing complexity likewise increases as recent buildings are added because additional routing peers are needed.

    With regard to device 2-10, the distribution module in the second pile of two interconnected switches requires four additional links for full-mesh connectivity to the first module. A third distribution module to support the third pile would require 8 additional links to support the connections to any the distribution switches, or a total of 12 links. A fourth module supporting the fourth pile would require 12 recent links for a total of 24 links between the distribution switches.

    As illustrated in device 2-11, having a dedicated core layer allows the campus to accommodate growth without requiring full-mesh connectivity between the distribution layers. This is particularly significant as the size of the campus grows either in number of distribution blocks, geographical area, or complexity. In a larger, more complex campus, the core provides the capacity and scaling capability for the campus as a whole and may house additional services such as security features.

    The question of when a sunder physical core is necessary depends on multiple factors. The competence of a several core to allow the campus network to decipher physical design challenges is important. However, remember that a key purpose of having a several campus core is to provide scalability and to minimize the risk from (and simplify) moves, adds, and changes in the campus network. In general, a network that requires routine configuration changes to the core devices does not yet Have the usurp degree of design modularization. As the network increases in size or complexity and changes originate to impress the core devices, it often points out design reasons for physically separating the core and distribution functions into different physical devices.

    In brief, although design networks without a core layer may drudgery at miniature scale, medium-sized to enterprise-sized networks, they require a core layer for design modularization and scalability.

    In conclusion of the hierarchical model presented in this section, despite its age, the hierarchical model is still relevant to campus network designs. For review, the layers are described as follows:

  • The access layer connects discontinuance devices such as PCs, access points, printers, and so on to the network.
  • The distribution layer has multiple roles, but primarily aggregates the multiple access layers. The distribution may terminate VLANs in Layer 2 to the access layer designs or provide routing downstream to the access layer with Layer 3 to the access layer designs.
  • The next section delves into a major pile obstruct of the campus network: the Cisco switch itself.


    Cisco Certified Network Professional (CCNP) | killexams.com true questions and Pass4sure dumps

    Related Resources: Books   Training   Practice_Exams   

    This vendor-specific Certification is Offered By:Cisco SystemsSan Jose, CA USAPhone: 800-553-6387Email: This email address is being protected from spambots. You requisite JavaScript enabled to view it.

    Skill Level: Intermediate                          Status: Active

    Low Cost: $600 (shortest track)               

    Summary:For individuals who Have at least one year of networking experience and are ready to promote their skills and drudgery independently on complex network solutions. CCNPs plan, implement, verify and troubleshoot local and wide-area enterprise networks and drudgery collaboratively with specialists on advanced security, voice, wireless and video solutions.

    Initial Requirements:You must first hold a cogent CCNA or any CCIE designation. Then you must pass three exams: Implementing Cisco IP Routing (ROUTE), Implementing Cisco IP Switched Networks (SWITCH), and Troubleshooting and Maintaining Cisco IP Networks (TSHOOT). Exams are 2 hours and $200 each.

    There are additional CCNP certifications available for specialized tracks such as wireless, data center, and security. For the complete list of current CCNP titles, follow the "See any Cisco Certifications" link near the bottom of this page.

    Continuing Requirements:Cisco professional smooth certifications are cogent for three years. To recertify, pass ONE of the following before the certification expiration date:

  • Pass any current 642-XXX Professional smooth exam, or
  • Pass any current CCIE Written Exam
  • OR any CCIE Certification can act as a pre-requisite, or
  • Pass the current CCDE Written Exam OR current CCDE Practical Exam, or
  • Pass the Cisco Certified Architect (CCAr) interview AND the CCAr board review to extend lower certifications.
  • CCNP Pay Chart:

    See any Cisco Certifications

    Vendor's page for this certification


    Latest And Updated Questions For 300-115 Exam (Updated 2017) | killexams.com true questions and Pass4sure dumps

    Cisco 300-115 exam is a vital certification in the IT world. A candidate who likes to surpass Cisco Certified Network Professional Routing and Switching certification successfully must prove their capability. As one of valuable and demanded exams today, 300-115 Implementing Cisco IP Switched Networks (SWITCH ) exam is not facile to surpass.

    Cisco Certified Network Professional Routing and Switching 300-115 Exam Description

    The Cisco 300-115 Cisco Certified Network Professional Routing and Switching certification exam is known as the Cisco Certified Network Professional Routing and Switching certification. Implementing Cisco IP Switched Networks (SWITCH ) are written examinations is taken online with Cisco certified centers. The question is the combinations of more complex and multiple altenative interactive Exam Product Types that examines the technical information in the Cisco Certified Network Professional Routing and Switching Cisco 300-115 Implementing Cisco IP Switched Networks (SWITCH ) exam is a close engage and there must live no outside resource materials permitted.

    Exam Information:
  • Exam Code: 300-115
  • Exam Name: Implementing Cisco IP Switched Networks (SWITCH ) Exam
  • Related Certification: Cisco Certified Network Professional Routing and Switching Certification
  • Exam language: English
  • Exam Format: MCQ’s
  • Cisco 300-115 Exam Preparation Through CertsTraining:

    To prepare for the Cisco 300-115 Implementing Cisco IP Switched Networks (SWITCH ) exam, you Have lots of techniques to select from. Here are some suggestions that you must involve in your studies:

  • Look for updated, accurate and trustworthy 300-115 Study Materials -A vital partake for Cisco 300-115 Exam Preparation is in search of some updated, trustworthy and genuine materials before you settle down. It can live made in distinguishing, CertsTraining offers the Cisco 300-115 Exam Questions that you examine for in both PDF as well as practice Test formats that are simple to learn and understand.
  • Practical practice through simulations-this is composed of a number of questions and at times their explanation too with reference in the most recent exam objectives. You will find several different types of 300–115 Cisco Certified Network Professional Routing and Switching exam simulators over the internet.
  • To know your precipitate in answering the 300–115 exam and to live on time with the duration, try to time your practice exam. As you snare ready for the 300–115 Cisco Certified Network Professional Routing and Switching exam, build certain that you’re capable to finish the exam within minutes or time frame in your practice session.
  • Utilize online forum — search the net as you could. Read some online publications and forum to collect more info about the 300–115 Implementing Cisco IP Switched Networks (SWITCH ) exam topics. It will assist you in data gathering. withhold in mind that forums are one hub to seek information from questions and find answers to your queries from these people in your field.
  • These are a few suggestions that you may account if you fancy to surpass the 300–115 Cisco Certified Network Professional Routing and Switching exam. You can complete preparation material from online.
  • In their recommendations only one company named “CertsTraining”. They are working very efficiently in Cisco certification field. They likewise provides helping, practice and demo material with free of cost.CertsTraining likewise offers 100% money back guarantee for those candidate, who couldn’t pass their 300-115 exam.
  • Get 300-115 Practice Exam

    you must prepare from Cisco 300-115 Implementing Cisco IP Switched Networks (SWITCH ) practice Exam for your Cisco 300-115 exam. You can find a lot of practice exams online that can support you to preparation for Cisco Certified Network Professional Routing and Switching 300-115 Implementing Cisco IP Switched Networks (SWITCH ) exam. 300-115 Implementing Cisco IP Switched Networks (SWITCH ) practice exams hold 300-115 Exam Question that are almost the same as in the Cisco Certified Network Professional Routing and Switching 300-115 true exam questions; this will tender you ideas what a true Cisco Certified Network Professional Routing and Switching 300-115 exam is.

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