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Saturday, October 29, 2011

Computer Networks - Test Interview Viva Voce

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Q1. Define Network with example. Give importance of computer network.



 

COMPUTER NETWORK
A computer network is a set of two or more computers connected together to share information and other resources. The computers in a network can share:
  1. Data, information  and Files
  2. Resources (printers, Cd-Rom Drives, DVD- Rom Drives, CD- Writers, hard disk, modems)
  3. Programs / software

EXAMPLES OF COMPUTER NETWORK


  1. Computer network can be used in an organization's office. Different employees and managers in the office and organization can share common information.

  2. Internet, is also an example of a computer network. Internet is a network of millions of computers connected through phone lines. People can share information, files and talk with one another through internet.

  3. Internet cafe also uses computer network for internet sharing on all computers.

  4. A Computer laboratory in a school or college may use local area network for sharing data and other reources like printers, Cd-Rom drives or hard disks etc.

ADVANTAGES OF COMPUTER NETWORKS

Following are some important advantages of computer networks:

  1. Information Sharing
    Data and information can be shared by many users.

    Hardware Sharing

  2. Hardware Resources like printer, scanner, CD-ROM drive and hard disk can also be shared.
  3. Money Saving
    We can save a lot of money by using the same software and hardware in a network.
  4. Easy and Fast Communication
    We can send and receive emails and share files with other people in the company or in any part of the world through network or internet.

Q2. Explain different types of computer networks: (LAN,WAN,MAN).

Main types of computer networks are: 1. LAN - Local-Area Network 2. WAN - Wide-Area Network 3. MAN - Metropolitan-Area Network

LAN (Local Area Network)

LAN stands for Local Area Network. It covers a small area. Most LANs are used to connect computers in a single building or group of buildings. Examples: Following are two examples of LAN: • LAN is used in a computer lab to connect computers. The students can share software, files and data in the lab. • In Internet cafe, many computers can be connected through LAN. These computers can share single connection of Internet.

2)WAN (Wide Area Network)

WAN stands for wide area network. It covers a large area. WAN connects computers in different cities, countries and continents. Computers in WAN are often connected through telephone lines. The largest WAN is the Internet. Examples of WAN • In air ticketing system like PIA, many offices can be joined together using WAN. A person can get a ticket from any office in the country. • A bank with many branches in different cities can connect its branches through WAN. The customer can use his account from any branch.



3)MAN (Metropolitan-Area Network)

A metropolitan area network (MAN) is a network that covers an area of the size of a city. Example: Mobile phones systems often use MAN.

Q3. Differentiate between LAN and WAN.

The differences between LAN and WAN is as follows:

LAN

WAN

1.

LAN is used to connect computers at one place.

WAN is used to connect computers anywhere in the world.
2.

LAN covers limited area.


WAN can cover more area.

3.

Data transfer speed is very fast in LAN.


Data transfer speed is slow in WAN.

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