Computer Network 2018- MCA 4th Sem AKTU

Printed Pages: 02 Sub Code: RCA402

Paper Id: 214422 Roll No. _____________________

MCA

(SEM IV) THEORY EXAMINATION 2017-18

COMPUTER NETWORK

Time: 3 Hours Total Marks: 70

Note: Attempt all Sections. If require any missing data; then choose suitably.

SECTION A

1. Attempt all questions in brief. 2 x 7 = 14

1. Define Radio wave.
2. Define Protocol. Give the need for Protocol Leayering.
3. Explain Nyquist Bit Rate.
4. Write about CSMA/CD Protocol.
5. Explain burst error.
6. Write about Socket?
7. Differentiate between Symmetric Key Encryption and Asymmetric Key Encryption.

SECTION B

2. Attempt any three of the folloing: 7 x 3 = 21

1. What is the switching? Briefly explain different Methods of Switching.
2. Define Data Communication. Describe Fundamental characteristics of Data Communication.
3. Briefly explain about IP Addressing. Differentiate between classful addressing and classless addressing.
4. What is congestion? Define congestion control with a suitable Example.
5. Briefly Explain Electronic mail system. Differentiate between POP3 and IMAP protocol.

SECTION C

3. Attempt any one part of the folloing: 7 x 1 = 7

1. What is Network topology? Explain differnent types of topologies.
2. Explain Transmission media. Differntiate guided media from unguided media.

4. Attempt any one part of the folloing: 7 x 1 = 7

1. Describe humming code. how it is used for error detection and correction? Illustrate with the help of a suitable example.
2. A classless address is given as 167.199.170.82/27. Find the
   1. The number of addresses in the network
   2. First address
   3. Last address

5. Attempt any one part of the folloing: 7 x 1 = 7

1. Explain any two connecting devices: hubs, link-layer switches, and routers.
2. What are the performance measure criteria of a Network? Explain.

6. Attempt any one part of the folloing: 7 x 1 = 7

1. Explain any two protocol.
   1. UDP
   2. TCP
   3. SCTP
2. Define Connectionless and Connnection-Oriented Protocols.

7. Attempt any one part of the folloing: 7 x 1 = 7

1. Define Cryptography. List four Cryptography Primitives.
2. Define Application-Layer Paradigms.