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Chapter8ccna Chapter8ccna Presentation Transcript

  • Instructor & Todd Lammle Sybex CCNA 640-802 Chapter 8: Layer-2 Switching
  • Chapter 8 Objectives
    • The CCNA Topics Covered in this chapter include:
    • What is layer-2 switching
    • Switching services
    • Bridges vs. LAN switching
    • Three switch functions
    • MAC table
    • Switching loops Spanning-Tree Protocol (STP)
  • Layer 2 Switching
    • Purposes for using switching
      • Breaks up collision domains
      • Cost-effective, resilient internetwork
    • Purpose for Spanning-Tree Protocol (STP)
      • Stops loops in layer 2 switched networks
  • Before Layer 2 Switching
  • Switched LANs
  • Typical Switched Designs
  • One link to the server!
  • Switching Services
    • Layer 2 switching provides:
      • Hardware-based bridging (ASIC)
      • Wire speed
      • Low latency
      • Low cost
  • Limitations of Layer 2 Switching
    • Must break up the collision domains correctly.
    • Make sure that users spend 80 percent of their time on the local segment.
    • Switches do not break up broadcast domains by default.
  • Bridging vs. LAN switching
  • Three Switch Functions at Layer-2
  • Empty MAC table
  • How Switches Learn Hosts’ Locations
  • Switching Loops
  • Switching Loop Problems
  • Spanning-Tree Protocol (STP) Solves Switching loops at layer 2
    • STP
    • Root Bridge
    • BPDU
    • Bridge ID
    • Nonroot Bridge
    • Root port
    • Designated port
    • Port cost
    • Nondesignated port
    • Forwarding port
    • Block port
  • Spanning-Tree Operations
    • Selecting the root bridge
    • Selecting the designated port
  • Switching Loops
  • Spanning-Tree Port States
    • Blocking
    • Listening
    • Forwarding
    • Disabled
  • Spanning-Tree Example
  • Written Labs and Review Questions
      • Open your books and go through all the written labs and the review questions.
      • Review the answers in class.