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Addressing

Addressing. Objectives. Addressing in the LAN IP address es MAC address es. Addressing. Mailbag: MAC addresses on it. Envelope: IP addresses on it. Letter. Data. Packet. Frame. Data = payload = what we pay for. Addressing. MAC Dest: 00:00:00:00:03:01, MAC Src: 00:00:00:00:03:02.

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Addressing

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  1. Addressing

  2. Objectives • Addressing in the LAN • IP addresses • MAC addresses

  3. Addressing Mailbag: MAC addresses on it Envelope: IP addresses on it Letter Data Packet Frame Data = payload = what we pay for

  4. Addressing MAC Dest: 00:00:00:00:03:01, MAC Src: 00:00:00:00:03:02 IP Dest: 192.168.1.2, IP Src: 192.168.3.2 Letter Data Packet Frame

  5. Addressing Let‘s send a letter from VM School to Helsinki School via Prague and Berlin. Frame is mailbag, Packet is envelope, Data is Letter. MAC Dest: Berlin Post Office, MAC Src: Prague Post Office IP Dest: Helsinki School, IP Src: VM School Letter Data Packet Frame

  6. Addressing Letter Packet = Envelope with Letter remains always the same !!! • The frame is • - Secretary‘s bag between VM School and VM Post Office • - mailbag between VM and Prague • - another mailbag between Prague and Berlin • another mailbag between Berlin and Helsinki • Postman‘s bag between Helsinki Post Office and Helsinki School

  7. Addressing Letter Packet = Envelope with Letter remains always the same !!!

  8. Addressing Data = payload = what we want to transport Packet Frame

  9. Addressing Let‘s ping from PC2 to PC1: ping 192.168.1.2

  10. Addressing • Each PC, each interface has its own • IP address, • which can be changed • MAC address, • which cannot be changed

  11. Addressing IP is always the same !!! Frame 1

  12. Addressing IP is always the same !!! Frame 2

  13. Addressing Frame 3 IP is always the same !!!

  14. IP Addressing

  15. MAC Addressing • MAC address • burned into ROM permanently • cannot be changed • 48 bits • hexadecimal notation • example: 00:60:2F:3A:07:BC

  16. MAC Addressing 48 bits

  17. Summary • Frame • changes between „stations“ • Packet • stays always the same during its travel • IP address • 32 bits • dotted-decimal notation • „written“ on packet – doesn‘t change during transportation • logical – device‘s IP can be changed • MAC address • 48 bits • hexadecimal notation • „written“ on frame - changes during transportation • physical – device‘s MAC cannot be changed

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