Data link and physical layers
OSI model The lower layers <ul><li>Hardware addresses
Cables and wifi </li></ul>
Repetition <ul><li>Connection between the client PCs?
Connection between Clint PC and ext. PC? </li></ul>
Inside a subnet <ul><li>Check destination IP
If local, get MAC address ass. to IP of dest.
Send data using dest MAC </li></ul>
Through routers <ul><li>Check destination IP
If not local, get MAC address ass. to GW
Send data using GW MAC </li></ul>
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ITET1 Routing DL and physical layers.odp

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ITET1 Routing DL and physical layers.odp

  1. 1. Data link and physical layers
  2. 2. OSI model The lower layers <ul><li>Hardware addresses
  3. 3. Cables and wifi </li></ul>
  4. 4. Repetition <ul><li>Connection between the client PCs?
  5. 5. Connection between Clint PC and ext. PC? </li></ul>
  6. 6. Inside a subnet <ul><li>Check destination IP
  7. 7. If local, get MAC address ass. to IP of dest.
  8. 8. Send data using dest MAC </li></ul>
  9. 9. Through routers <ul><li>Check destination IP
  10. 10. If not local, get MAC address ass. to GW
  11. 11. Send data using GW MAC </li></ul>
  12. 12. Arp cache New entry
  13. 13. Exercise <ul><li>Use wireshark to </li><ul><li>Find the MAC address of the gateway
  14. 14. Find other MAC addresses </li></ul><li>Query your local ARP database </li><ul><li>Use 'arp' </li></ul></ul>
  15. 15. On the wire
  16. 16. MAC addresses <ul><li>Hardware address
  17. 17. IEEE 802.3 </li><ul><li>Cables ethernet
  18. 18. 10/100/1000 Mbps
  19. 19. CSMA/CD </li></ul><li>IEEE 802.11 b/g/n </li></ul>
  20. 20. Switch <ul><li>“Link layer switch”
  21. 21. Self learning
  22. 22. Uses MAC address </li></ul>
  23. 23. Exercise <ul><li>Compare </li><ul><li>Routers
  24. 24. Switches
  25. 25. Hubs
  26. 26. Repeaters </li></ul></ul>

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