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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

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instructor todd lammle
Instructor & Todd Lammle

Sybex CCNA 640-802

Chapter 8: Layer-2 Switching

chapter 8 objectives
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
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
switching services
Switching Services

Layer 2 switching provides:

  • Hardware-based bridging (ASIC)
  • Wire speed
  • Low latency
  • Low cost
limitations of layer 2 switching
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.
spanning tree protocol stp solves switching loops at layer 2
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
Spanning-Tree Operations
  • Selecting the root bridge
  • Selecting the designated port
spanning tree port states
Spanning-Tree Port States
  • Blocking
  • Listening
  • Forwarding
  • Disabled
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