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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