Lesson 3 Ports and protocols

Table of Contents
“License for Use” Information . 2
Contributors 4
3.1 Introduction 5
3.2 Basic concepts of networks .6
3.2.1 Devices .6
3.2.2 Topologies 6
3.3 TCP/IP model . 7
3.3.1 Introduction 7
3.3.2 Layers 7
3.3.2.1 Application .7
3.3.2.2 Transport .7
3.3.2.3 Internet 8
3.3.2.4 Network Access .8
3.3.3 Protocols .8
3.3.3.1 Application layer protocols 9
3.3.3.2 Transport layer Protocols 9
3.3.3.3 Internet layer Protocols . 9
3.3.4 IP Addresses 9
3.3.5 Ports 12
3.3.6 Encapsulation 13
3.4 Exercises 14
3.4.1 Exercise 1: Netstat 14
3.4.2 Exercise 2: Ports and Protocols 15
3.4.3 Exercise 3: My First Server 15
Further Reading .17