Engenheiro

Computer Communication Networks — Lecture Notes

D.B. Hoang and K.J. Pye

1995 edition (7.54 p.m. 31January, 1996)

School of Electronic Engineering, La Trobe University

Preface
These notes are very heavily based in parts on notes originally written by Dr D.B. Hoang. They have since been modified and extended by Mr K.J. Pye. Consequently all mistakes are the responsibility of Mr Pye who would be grateful to receive comments on how these notes might be improved.

Contents
Chapter 1. Network Architecture .. .. .. .. .. .. .. .. .. 1.1. Introduction .. .. .. .. .. .. .. .. .. .. .. .. 1.2. The ISO and other models .. .. .. .. .. .. .. .. 1.2.1. Layer 1: the physical layer .. .. .. .. .. 1.2.2. Layer 2: the data link layer .. .. .. .. .. 1.2.3. Layer 3: the network layer .. .. .. .. .. 1.2.4. Layer 4: the transport layer .. .. .. .. .. 1.2.5. Layer 5: the session layer .. .. .. .. .. .. 1.2.6. Layer 6: the presentation layer .. .. .. .. 1.2.7. Layer 7: the application layer .. .. .. .. .. 1.3. Examples of Network Architectures .. .. .. .. .. 1.3.1. IBM’s System Network Architecture (SNA) .. 1.3.2. DECNET’s DNA (Digital Network Architecture) Chapter 2. 2.1. 2.2. 2.3. 2.4. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 1 1 1 1 1 2 2 3 3 4 4 4 5 8 8 8 8 10 10 11 12 13 13 14 14 16 17 20 20 20 21 21 23

.. .. .. .. .. .. .. .. .. .. The Data Link Layer Introduction .. .. .. .. .. .. .. .. .. .. .. .. .. Simplified Model .. .. .. .. .. .. .. .. .. .. .. Functions and requirements of the Data Link Protocols .. Elementary Data Link Protocols .. .. .. .. .. .. .. 2.4.1. An unrestricted