INTRODUCTION TO COMPUTER NETWORKS

uptightexampleNetworking and Communications

Oct 24, 2013 (3 years and 9 months ago)

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Chapter 2

Introduction to Computer Networks





INTRODUCTION TO COMPUTER
NETWORKS

Learning outcomes


The difference between networks and internets


The difference between logical and physical
addresses


What is a protocol in the context of computer
networking


How protocols are used on remote computers to
communicate easily


Explain the concept of layering


OSI ,


TCP/IP and


hybrid models

Reading


Joe Casad, Teach Yourself TCP/IP, Chs 1
-
2


William Buchana, Mastering the Internet, Ch. 3


Neil Briscoe, Understanding the 7
-
layer OSI model, July 2000.


http://pcnetworkadvisor.com


Julian Moss, Understanding TCP/IP (first part September 1997)


http://pcnetworkadvisor.com



What is a network?


A network consists of two or more computers


connected by network media


.i.e cables, telephone lines, radio waves


share the same resources such as database, printer


Exchange files


Exchange electronic message between each others


Email


Example of a simple network

How are they linked?


Computers on a
network may be linked
through:


cables,


telephone lines,


radio waves, satellites or


wireless technologies


Router

An example of a network

Internet

Segment

Node

Hub

Hub

Bridge

Applications of Networks

Introduction to Computer Networks


Resource Sharing

Hardware (computing resources, disks, printers)

Software (application software)

Information Sharing

Easy accessibility from anywhere (files, databases)

Search Capability (WWW)

Communication

Email

Message broadcast

Remote computing

Distributed processing (GRID Computing)


Categories of networks


A LAN is a network that is used for communicating among
computer devices, usually within an office building or
home


LAN’s enable the sharing of resources such as files or
hardware devices that may be needed by multiple users



Is limited in size, typically spanning a few hundred
meters, and no more than a mile


Is very fast, with speeds from 10 Mbps to 10 Gbps


Requires very little wiring, typically a single cable
connecting to each device


Has lower cost compared to MAN’s or WAN’s






Local Area Network

LAN

LAN (Continued)



MAN is designed extended over an entire city.


May be wholly owned and operated by a private company, or it
may be a service provided by a public company, such as a local
telephone company.

Metropolitan
-
Area Networks (MAN)


Provides long
-
distance transmission of data, voice, image, and video
information over large geographic areas

Wide
-
Area Networks (WAN)

WAN (Continued)


WANs connect larger
areas, such as whole
states, or even the world.



Transoceanic cables and
satellites are used to
connect WANs