Chapter 1 – Enterprise Campus Network Design

  • What is a campus network?
    • An enterprise network consisting of many LANs in one or more buildings, all connected and all usually in the same place.
  • How do you reduce the size of a collision domain?
    • Using switches – one host one switch port.
  • How do you reduce the size size of broadcast domain?
    • Using routers.
  • What is a collapsed core network?
    • When there are no 3 different layers in a campus, only 2. The distribution and core switches are combined.
  • What is a switch block?
    • A switch block contains the access and distribution devices.
  • What size should a switchblock have? What is it based on?
    • traffic types and behavior
    • size and number of common workgroups
  • What is the recommended boundary of VLANs?
    • The VLANs should not extend beyond the distribution switches.
  • What is the purpose of the Core layer?
    • It connects 2 or more switchblocks in the campus.
  • What is the recommended design regarding the load?
    • the upper layer device should be designed to carry the aggregated amount of traffic load handled by the connected lower layer devices
      ie.: the uplink/crosslink of a core switch should be able to carry the aggregated traffic of the connected distribution switches







  • What are the desired properties of an access switch?
    • high port density
    • PoE
    • low cost


  • What are the desired properties of distribution and core switches?
    • high Layer 3 switching throughput
    • high density of high-bandwidth optical media







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