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Chapter8ccna Chapter8ccna Presentation Transcript

  • Sybex CCNA 640-802 Chapter 8: Layer-2 Switching Instructor & Todd Lammle
  • 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) 2
  • 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. 21