1. © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Addressing

2. ITE PC v4.0 Chapter 1 2 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Objectives  Addressing in the LAN  IP addresses  MAC addresses

3. ITE PC v4.0 Chapter 1 3 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Data = payload = what we pay for Data Envelope: IP addresses on it Mailbag: MAC addresses on it Frame Packet Letter

4. ITE PC v4.0 Chapter 1 4 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Data IP Dest: 192.168.1.2, IP Src: 192.168.3.2 MAC Dest: 00:00:00:00:03:01, MAC Src: 00:00:00:00:03:02 Frame Packet Letter

5. ITE PC v4.0 Chapter 1 5 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Data IP Dest: Helsinki School, IP Src: VM School MAC Dest: Berlin Post Office, MAC Src: Prague Post Office Frame Packet Let‘s send a letter from VM School to Helsinki School via Prague and Berlin. Frame is mailbag, Packet is envelope, Data is Letter. Letter

6. ITE PC v4.0 Chapter 1 6 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing 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 Letter Packet = Envelope with Letter remains always the same !!!

7. ITE PC v4.0 Chapter 1 7 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Packet = Envelope with Letter remains always the same !!! Letter

8. ITE PC v4.0 Chapter 1 8 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Data = payload = what we want to transport Packet Frame

9. ITE PC v4.0 Chapter 1 9 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Let‘s ping from PC2 to PC1: ping 192.168.1.2

10. ITE PC v4.0 Chapter 1 10 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing Each PC, each interface has its own IP address, which can be changed MAC address, which cannot be changed

11. ITE PC v4.0 Chapter 1 11 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing IP is always the same !!! Frame 1

12. ITE PC v4.0 Chapter 1 12 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing IP is always the same !!! Frame 2

13. ITE PC v4.0 Chapter 1 13 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Addressing IP is always the same !!! Frame 3

14. ITE PC v4.0 Chapter 1 14 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public IP Addressing

15. ITE PC v4.0 Chapter 1 15 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public MAC Addressing MAC address burned into ROM permanently cannot be changed 48 bits hexadecimal notation example: 00:60:2F:3A:07:BC

16. ITE PC v4.0 Chapter 1 16 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public MAC Addressing 48 bits

17. ITE PC v4.0 Chapter 1 17 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 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