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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.