PPT on networking

computer network

 

Ø  A Computer network is define as the interconnection of two or more computers. It is done to enable the computers to communicate and share available resources

.

 

 

Ø APPLICATION

§ Sharing of resources such as printer.

§ Sharing of expensive database and software.

§ Communication  from one computer to another computer.

§ Exchange of data and information among users via network.

§ Sharing of information over geographically wide areas.

 

Component of computer network

 

 

ØTwo or more computer

Ø  Cables as link between the computers

Ø  A NIC on each computer

Ø  Switches

Ø  Software called OS (operation system)

NETWORK BENIFITS

 

 

 

ØThe network provided to the user can be divided into two categories

§ Sharing

§ Connectivity

 

OTHER BENEFITS OF COMPUTER NETWORK

 

ØIncreased speed

ØReduced cost

ØImprove security

ØCentralized software

ØElectronic mail

ØFlexible access

 

Disadvantages of

 

network

 

ØHigh cost of installation

Ø Failure of server

Ø Cable faults

 

LOCAL AREA NETWORK

 

 (LAN)

 

ØLAN is a network which is designed to

 operate over a small physical area such as

 an office , factory or a  group of buildings.

ØLAN’S are easy to design and troubleshoot.

Ø Exchange of information and sharing of

 resources become easy because of LAN.

Ø It is usually a privately owned networks.

 

WIDE AREA NETWORK

              (WAN)

ØIt is cheaper and more efficient.

 

ØMost WAN networks are used to transfer

 large   blocks of data between its user.

ØThe communication between different

 user of WAN is established using leased telephone lines, satellite links and similar

 channel.

 

 

PERSONAL AREA NETWORK (PAN)

 

ØA Personal area network is a computer network organized around an individual

 personal.

ØIt generally consists of a mobile

 computer, a cell phone or personal digital

 assistant. PAN enables the communicationn among these device.

ØThe PANs can be constructed using wireless or cables.

METROPOLITAN AREA NETWORK (MAN)

 

ØIt is in between LAN & WAN technology that covers the entire city.

Ø It uses similar technology as LAN.

Ø It can be a single network such as cable TV

 network, or a measure of connecting a

 number of LAN’s a large network so that

 resources can be shared LAN to LAN as well

 as device to device.

 

CAMPUS AREA NETWORK(CAN)

ØThe campus area network is made up of

an interconnection   of LAN with limited geographical area.

Ø Network equipments such as switches, routers and the transmission media i.e.

optical fiber etc are almost entirely owned

 by the campus owner.

 

DIFFERENCE BETWEEN

    LAN,WAN,MAN

 

PARAMETERS	LAN	WAN	MAN
Ownership of network	Private	private or public	Private or public
Geographical are covered	Small	Very large	Moderate
Design and maintenance	Easy	Not  easy	Not  easy
Communication medium	Coax cable	PSTN or satellite links	Coax cables, PSTN, optical fiber , cables , wireless
Bandwidth	Low	High	Moderate
Data rates (speed)	High	Low	Moderate