This document discusses computer networks and data communication. It defines data communication as the electronic transmission of data and information between computers and other devices. A computer network is described as the physical interconnection of two or more computers to share resources. The key components of a computer network are identified as hardware components like servers, clients, network adapters, cables, and software components like network operating systems and protocols. Advantages of networks include easy sharing of data and resources while disadvantages include security risks and costs.

1. NETWORK
Data Communication and Computer Network
Mahesh Sharma, Computer Facilitator Ritamvara School

2. Introduction
Communication: Sending and Receiving of
data and information through electronic
medium
Telecommunication: Electronic medium such
as Telephones, Radio, Television are used.
Data Communication: Electronic medium such
as Computers, Laptops are used.

3. Components of Data
Communication
Data or Information
Sender
Medium
Receiver
Protocol

4. Computer Network
(C.N.)
Definition: Physical Interconnection between
two or more computers.
In other words: Group of Interconnected
computers through transmission media in
order to share resources

5. Components of Computer
Network
Hardware Component and Software component
 Server
 Clients
 Network Adapter
 Cable connector
 Communication Media
 Network operating Device
 Network Connecting device

6. Hardware components of
C.N.
Server – Service Providing Computer
 Client – Service Receiving Computer
 Network Adapter – Interface in computer
network
 Communication Media – Twisted Cable, Co-
axial Cables, WIFI, Satellite etc.
 Cable Connectors: RJ 45, BNC ST,
Connectors etc.
 Network Connecting Device: MODEM, Router,
Switch, Hub.

7. Software components of
C.N.
Software Components:
Network Operating System(NOS): Example-
Linux OS, Unix OS, etc.
Network Protocols: Set of instructions or rules
for connecting to internet.
Example: TCP/IP, FTP, HTTP, SMTP, POP are
some popular common protocols in computer
network.

8. Advantages and Disadvantages
of Computer Network
 It allows exchanging
data and information
between users
 Communication is
easy and fast
 Sharing of Hardware
and other resources
 Easy for backup of
data
 Expensive for
connection of
computers
 Not safe from
hackers and
crackers
 Requires special
technical knowledge
and skills to operate
Advantages of Computer Network
Disadvantages of Computer
Network

9. Any Questions???