Computer networks

M I T E S H V A R T A K
D A H A N U C E N T R E
COMPUTER NETWORKS

Computer Networks
A network consists of two or more computers
that are linked in order to share resources
(such as printers and CDs), exchange files,
or allow electronic communications.
The computers on a network may be linked
through cables, telephone lines, radio waves,
satellites etc.
A popular example of a computer network is
the Internet, which allows millions of users to
share information.

Every Network Includes
1. At least two computers that have something to
share.
2. A cable or wireless pathway, called
Transmission Media, for computers to
signal each other.
3. Rules, called Protocols, so that computers
can use the unified principle of data
communication.
4. Networking Interface Cards (NIC)

Advantages of Computer
Networks
File Sharing: Networks offer a quick and
easy way to share files directly.
Resource Sharing: All computers in the
network can share resources such as
printers, fax machines, modems and
scanners.
Communication: Those on the network can
communicate with each other via e-mail,
instant messages etc.

Advantages of Computer
Networks
Flexible Access: Networks allow their users to
access files from computers throughout the
network.
Sharing of Information: Computer networks
enable us to share data and information with
the computers that are located geographically
large distance apart.

Network Computing Models
Centralized Computing
(Client-Server Network)
A client-server network is where every
client is connected to the server .
Server or mainframe computer has huge
storage and processing capabilities.

Uses of Computer Network
Simultaneous Access
Shared Peripheral Devices
Personal Communication
Easier Backup

What is Ethernet?
A group of standards for defining a local area
network that includes standards in cabling and
the structure of the data sent over those cables
as well as the hardware that connects those
cables.
Independent of the network architecture.
Flavors of Ethernet:
◦ IEEE 802.3 Ethernet Specification
◦ Great detail specifying cable types, data formats, and
procedures for transferring that data through those
cables
◦ IEEE 802.5 Token Ring Specification

APPLICATIONS OF NETWOKS
E-mail
Searchable Data (Web Sites)
E-Commerce
News Groups
Internet Telephony (VoIP)
Video Conferencing
Chat Groups
Instant Messengers
Internet Radio

Computer networks

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