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Informatics Practices XII C (S-II)


Mr Baiju Viswanathan, PGT (CS)

Date of submission: 23 June 2014


1. Which communication channel(s) is/are suitable in each of the following situations:

a. Setting up a LAN

b. Transfer of data from a laptop to a mobile phone.

c. Transfer of data from one mobile phone to another.

d. Creating a remote control that can control multiple devices in a home.

e. Very fast communication between two offices in two different countries.

f. Communication in a hilly area

g. Communication within a city and its vicinity where cost of cabling is too high.

2. (a) What is a computer network? What are its advantages?

(b) What is meant be communication channels? Give two examples of guided media and

two examples of unguided media.

3. Differentiate (with examples wherever possible) between :

a. LAN and MAN b. MAN and WAN

c. Hub and Switch d. Guided and Unguided media e. Router and gateway

4. Give some examples of domain names and URLs. How is a domain name different

from a URL?What is domain name resolution?

5. Diagramatically show how would you connect 6 PCs, 1 server, 1 printer, and 2

scanners in

a. Star topology b. Bus topology

6. clip_image002

7. The Great Brain Organisation has set up its new Branch at Srinagar for its office and web based activities. It has 4 Wings of buildings as shown in the diagram :


Center to center distances between various blocks

Wing X to Wing Z


Wing Z to Wing Y


Wing Y to Wing X


Wing Y to Wing U


Wing X to Wing U


Wing Z to Wing U


Number of Computers

Wing X


Wing Z


Wing Y


Wing U


(i) Suggest a most suitable cable layout of connections between the Wings, and topology.

(ii) Suggest the most suitable place (i.e. Wing) to house the server of this organisation with a suitable reason, with justification.

(iii) Suggest the placement of the following devices with justification: 1. Repeater

2. Hub/Switch

(iv) The organization is planning to link its head office situated in Delhi with the offices at Srinagar. Suggest an economic way to connect it; the company is

ready to compromise on the speed of connectivity. Justify your answer.

8. Define network security. Explain in details the different network security attacks.


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