Class 10 Computer Engineering Computer Network 2072 Solved Question Paper

 

SEE 2072

Group A

1.       What is the main purpose of computer network?

àThe main purposes of computer network are:

·         To share information and hardware resources.

·         To facilitate the communication via email, video conferencing, instant messaging etc.

 

2.       Define LAN.

à A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building.

 

3.       What is the main function of router?

àThe main function of router is to find out the best route or path that can be used for transmission.

 

4.       Define Guided media.

àThe communication channel in which different types of wires are used to transfer data are called guided media.

 

5.       Define plain text.

 

àPlain text is the original message before encryption or after decryption.

 

Group B

6.       What are the different types of network connection? Define any one. *

à Different types of network connection are:

·         LAN

·         MAN

·         WAN

 

7.       How can performance of network checked? Explain in brief.*

à Network performance refers to measures of service quality of a network as seen by the customer. There are many different ways to measure the performance of a network, as each network is different in nature and design. The following measures are often considered important:

·         Bandwidth: it commonly measured in bits/second is the maximum rate that information can be transferred

·         Throughput: it is the actual rate that information is transferred

·         Latency: it is the delay between the sender and the receiver decoding it, this is mainly a function of the signals travel time, and processing time at any nodes the information traverses

·         Jitter: it is the variation in packet delay at the receiver of the information

·         Error rate: it is the number of corrupted bits expressed as a percentage or fraction of the total sent

 

8.       List out different types of computer network.

àThe types of computer network are:

·         LAN(Local Area Network)

·         MAN(Metropolitan Area Network)

·         WAN(Wide Area Network)

 

9.       What is repeater? Why is it used?

à Repeaters are network devices operating at physical layer of the OSI model that amplify or regenerate an incoming signal and retransmit it. Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction.

 

10.   Differentiate between switch and Hub.

à

Switch	Hub
Switch works on data link layer of OSI model	Hub works on physical layer of OSI model.
Switch follows multicast, unicast, and broadcast type transmission.	Hub follows broadcast transmission.
Switch is an intelligent device that sends message to selected destination	Hub is not an intelligent device that sends message to all ports
It is comparatively expensive.	It is comparatively inexpensive

 

11.   Write any four benefits of OSI model.

àFour benefits of OSI reference model are:

·         It distinctly separates services, interfaces, and protocols. Hence, it is flexible in nature.

·         It is a generic model and acts as a guidance tool to develop any network model.

·         It supports connection-oriented as well as connectionless.

·         This layered architecture follows abstraction principle that means if one layer is change than layer does not impact much on other layers

          Disadvantages:

·         It is purely a theoretical model that does not consider the availability of appropriate technology

·         There is a duplication of services in various layers. Services like addressing, flow control and error control are offered by multiple layers

·         Though there are many layers, some of the layers like the session layer and presentation layer have very little functionality when practically deployed

·         The OSI model is very complex

 

12.   Write any two difference between TCP/IP and OSI model.

à

OSI Model	TCP/IP model
It is a reference model	It is implementation of OSI model
Has 7 layers	Has 4 layers
Has separate session and presentation layer	Combines session and presentation layer in application layer
Model was developed before the development of protocols	Protocols were developed first and then the model was developed.
Supports both connectionless and connection oriented communication in network layer, but only connection-oriented communication in transport layer.	Supports only connectionless communication in network layer, but both connection oriented and connectionless communication in transport layer.

 

13.   Draw neat and clean figure of coaxial cable.

à28

 

14.   What do you mean by wireless transmission medium? Give any two example of it.

à The communication channel in which data are transmitted through waves instead of wires are wireless transmission medium. Two example of such medium are:

·         Microwave

·         Satellite

·         Infrared

·         Radio waves

 

15.   Draw neat and clean figure of Ring topology.

àNote

 

16.   Define encryption and decryption.

àEncryption is the process of scrambling plain text into cipher text using encryption key.

Decryption is the process of regaining the plain text form cipher text using decryption key.

 

17.   What is cryptography? Explain in short.

à Cryptography is technique of securing information and communications through use of codes so that only those person for whom the information is intended can understand it and process it.

  In today’s age of computers cryptography is often associated with the process where an ordinary plain text is converted to cipher text which is the text made such that intended receiver of the text can only decode it and hence this process is known as encryption. The process of conversion of cipher text to plain text is known as decryption.

 

Modern cryptography concerns itself with the following four objectives:

 

·         Confidentiality. The information cannot be understood by anyone for whom it was unintended.

·         Integrity The information cannot be altered in storage or transit between sender and intended receiver without the alteration being detected.

·         Non-repudiation. The creator/sender of the information cannot deny at a later stage their intentions in the creation or transmission of the information.

·         Authentication. The sender and receiver can confirm each other's identity and the origin/destination of the information

 

18.   What is the use of computer network in these days? Explain.

àThe computer is used for the following purposes these days:

·         Information and Resource Sharing: Programs and software in any computer can be accessed by other computers linked to the network. It also allows sharing of hardware equipment, like printers and scanners among varied users.

·         User communication: Networks allow users to communicate using e-mail, newsgroups, and video conferencing etc.

Group C

19.   What are the application area of computer network? Explain mobile application.

àThe application areas of computer network are:

·         Business application

·         Home application

·         Mobile application

Mobile Application: Mobile application is one of the growing concern of the computer network. People are mostly using the mobile devices such as tablet, smart phones, PDAs (Personal Digital Assistants), notebooks for computing. Many of these people have desktop or laptop computer in their home still using these mobile devices because these devices are easier to use and can be carried with ease with the feature of wireless connection.

 

20.   Is Internet WAN? Why? Explain. *

à The Internet itself is a WAN, because it covers the entire globe.