1. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

2. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Chapter Two Network Architecture and Protocols

3. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Servers and clients need to speak the same language Figure 2.1

4. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The seven-layer OSI Reference Model Figure 2.2

5. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Peer-to-peer information exchange Figure 2.3

6. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Concept of service access points (SAPs) Figure 2.4

7. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Peer-to-peer transmission process of an NPDU Figure 2.5

8. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Time-sequence diagram for service primitives Figure 2.6

9. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Example of a protocol executing a layer 2 (data link) service Figure 2.7

10. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Flow of information through a typical layered network Figure 2.8

11. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the application layer Figure 2.9

12. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the presentation layer Figure 2.10

13. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the session layer Figure 2.11

14. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the transport layer Figure 2.12

15. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the network layer Figure 2.13

16. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the data link layer Figure 2.14

17. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Exchanges of data units at the physical layer Figure 2.15

18. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Comparison of the TCP/IP and OSI models Figure 2.16

19. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Encapsulation of data units using TCP/IP Figure 2.17

20. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Client/server view of an e-mail exchange Figure 2.18

21. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Linking to a web page using HTTP Figure 2.19

22. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl FTP process in a client/server setting Figure 2.20

23. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Use of routers to transfer information between networks Figure 2.21

24. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl The IEEE 802 LAN model Figure 2.22

25. “Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Companies srl Formats of an LLC PDU and a generic MAC frame Figure 2.23