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“Local Area Networks” - Gerd Keiser Copyright © 2003 - The McGraw-Hill Local Area Networks Gerd Keiser

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

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Page 1: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Local Area Networks

Gerd Keiser

Page 2: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Chapter Two

Network Architecture and Protocols

Page 3: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Servers and clients need to speak the same languageFigure 2.1

Page 4: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

The seven-layer OSI Reference ModelFigure 2.2

Page 5: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Peer-to-peer information exchangeFigure 2.3

Page 6: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Concept of service access points (SAPs)Figure 2.4

Page 7: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Peer-to-peer transmission process of an NPDUFigure 2.5

Page 8: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Time-sequence diagram for service primitivesFigure 2.6

Page 9: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Example of a protocol executing a layer 2 (data link) serviceFigure 2.7

Page 10: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Flow of information through a typical layered networkFigure 2.8

Page 11: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the application layerFigure 2.9

Page 12: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the presentation layer Figure 2.10

Page 13: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the session layer Figure 2.11

Page 14: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the transport layer Figure 2.12

Page 15: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the network layer Figure 2.13

Page 16: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the data link layer Figure 2.14

Page 17: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Exchanges of data units at the physical layer Figure 2.15

Page 18: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Comparison of the TCP/IP and OSI modelsFigure 2.16

Page 19: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Encapsulation of data units using TCP/IPFigure 2.17

Page 20: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Client/server view of an e-mail exchangeFigure 2.18

Page 21: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Linking to a web page using HTTPFigure 2.19

Page 22: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

FTP process in a client/server settingFigure 2.20

Page 23: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Use of routers to transfer information between networksFigure 2.21

Page 24: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

The IEEE 802 LAN modelFigure 2.22

Page 25: Local Area Networks - Gerd Keiser Copyright  2003 - The McGraw-Hill Companies srl Local Area Networks Gerd Keiser

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

Formats of an LLC PDU and a generic MAC frameFigure 2.23