“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

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

Servers and clients need to speak the same languageFigure 2.1

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

The seven-layer OSI Reference ModelFigure 2.2

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

Peer-to-peer information exchangeFigure 2.3

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

Concept of service access points (SAPs)Figure 2.4

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

Peer-to-peer transmission process of an NPDUFigure 2.5

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

Time-sequence diagram for service primitivesFigure 2.6

“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

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

Flow of information through a typical layered networkFigure 2.8

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

Exchanges of data units at the application layerFigure 2.9

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

Exchanges of data units at the presentation layer Figure 2.10

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

Exchanges of data units at the session layer Figure 2.11

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

Exchanges of data units at the transport layer Figure 2.12

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

Exchanges of data units at the network layer Figure 2.13

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

Exchanges of data units at the data link layer Figure 2.14

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

Exchanges of data units at the physical layer Figure 2.15

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

Comparison of the TCP/IP and OSI modelsFigure 2.16

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

Encapsulation of data units using TCP/IPFigure 2.17

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

Client/server view of an e-mail exchangeFigure 2.18

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

Linking to a web page using HTTPFigure 2.19

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

FTP process in a client/server settingFigure 2.20

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

Use of routers to transfer information between networksFigure 2.21

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

The IEEE 802 LAN modelFigure 2.22

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

Formats of an LLC PDU and a generic MAC frameFigure 2.23