COMMUNICATION NETWORKS

SUNAWAR KHAN MS(CS)

IIUI

What Is?

Computer networks consist of Two or more computer that are connected together.

Share information and resources Resources may include printer hard disk, scanners, application etc.

Connected through communication media Guided or Un-Guided

Network can be in the same room, building or at different places.

Types of Computer Networks

Computer Networks are categorized according to How they are organized physically The way they were used The distance over which they operate

Three Main type of Computer Network as Follows LAN(Local Area Network) WAN(Wide Area Network) MAN(Metropolitan Area Network)

Types of Computer Networks

C/N

WANLAN MAN

Figure

Figure

LANLocal Area Network

Section 1

INTRODUCTION

Covers Small Area Most Commonly Type of Network Nodes are Connected using Cables Covers Limited Area

OfficeLaboratoryBuilding or Group of Building etc.

INTRODUCTION

Very Fast Data RateTransmission Speed 10Mbps to

1000MbpsTransmit Data in Limited DistanceLimited Number of Computer can

Attached

TOPOLOGIES

Tree Bus

Special case of treeOne trunk, no branches

Ring Star

ADVANTAGES/DISADVANTAGES

Advantages Resource Sharing Application Sharing Centralized Data Data Security & Management Internet Sharing

Disadvantages Privacy Threat Expensive to Install Data Security Concerns

WANWide Area Network

Section 2

INTRODUCTION

Covers Large Area Different Cities Countries

Usually Connect Different LAN Connect through Telephone Lines Connected through Leased Lines or Satellite Reach Part of the world that is not possible with LAN Transmission rate is typically 56Kbps to 50Mbps

Examples

ATMS of banks located in different cities NADRA office located in different cities of Pakistan.

ADVANTAGES/DISADVANTAGES

Advantages Communication Facility Remote Data Entry Centralized Data Entertainment

Disadvantages Hardware, Software and Setup Cost Hardware and Software Management Cost Data Security Concerns Failure of Servers

MANMetropolitan Area Network

Section 3

INTRODUCTION

Covers large area but Smaller than WAN It is usually connect two cities or towns Examples

Connect different branches of a company in same city

Connect different campuses of a college in a city Cable TV networks in a City. Mobile Cellular System

Mostly use Fiber Optic Cable in these days.

ADVANTAGES/DISADVANTAGES

AdvantagesMAN covers larger area than LANProvide higher data rate than LAN

DisadvantageMore expensive than LANDifficult to maintain

THANKS