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Instructor  & Todd Lammle Sybex CCNA 640-802  Chapter 8: Layer-2 Switching
Chapter 8 Objectives <ul><li>The CCNA Topics Covered in this chapter include: </li></ul><ul><li>What is layer-2 switching ...
Layer 2 Switching  <ul><li>Purposes for using switching </li></ul><ul><ul><li>Breaks up collision domains </li></ul></ul><...
Before Layer 2 Switching
Switched LANs
Typical Switched Designs
One link to the server!
Switching Services <ul><li>Layer 2 switching provides: </li></ul><ul><ul><li>Hardware-based bridging (ASIC) </li></ul></ul...
Limitations of Layer 2 Switching <ul><li>Must break up the collision domains correctly. </li></ul><ul><li>Make sure that u...
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 <ul><li>STP </li></ul><ul><li>Root Bridge </li></ul><ul><li...
Spanning-Tree Operations <ul><li>Selecting the root bridge </li></ul><ul><li>Selecting the designated port </li></ul>
Switching Loops
Spanning-Tree Port States <ul><li>Blocking </li></ul><ul><li>Listening </li></ul><ul><li>Forwarding </li></ul><ul><li>Disa...
Spanning-Tree Example
Written Labs and Review Questions <ul><ul><li>Open your books and go through all the written labs and the review questions...
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Chapter8ccna

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Transcript of "Chapter8ccna"

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