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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

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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


Before layer 2 switching

Before Layer 2 Switching


Switched lans

Switched LANs


Typical switched designs

Typical Switched Designs


One link to the server

One link to the server!


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.


Bridging vs lan switching

Bridging vs. LAN switching


Three switch functions at layer 2

Three Switch Functions at Layer-2


Empty mac table

Empty MAC table


How switches learn hosts locations

How Switches Learn Hosts’ Locations


Switching loops

Switching Loops


Switching loop problems

Switching Loop Problems


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


Switching loops1

Switching Loops


Spanning tree port states

Spanning-Tree Port States

  • Blocking

  • Listening

  • Forwarding

  • Disabled


Spanning tree example

Spanning-Tree Example


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