Monday, January 23, 2023

Dr. A.P.J. Abdul Kalam University MCA III SEM Computer Networks [MCA305] Dec 2020 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Computer Application

Third Semester Main Examination, Dec-2020

Computer Networks [MCA305]

Time: 3:00 Hrs. Max Marks 70

Note: Answer any five questions. All questions carry equal marks.

Q.1 (a) What is a routing protocol? Explain in detail about the protocol data units? What is its Key Element?

(b) What is error control? Explain CRC with an example?

Q.2 (a) Discuss about the data communication networking in detail. Describe various Classifications of

communication networks.

(b) Differentiate between Router & gateway on the base of their functionalities.

Q.3 (a) Explain Network security. Describe cryptography.

(b) Explain the following:

(i) Token bus & Token ring

(ii) FDDI Protocol

(iii) DQDB Protocol

Q.4 (a) Explain CSMA and CSMA/CD protocols? Also discuss channel allocation?

(b) What is the difference between pure ALOHA and slotted ALOHA? What is vulnerable time in pure

ALOHA?

Q.5 (a) Explain the Bellman Ford algorithm for routing in network with an example.

(b) What is Hubs? Discuss different types of hubs.

Q.6 (a) Write short note:

(i) SNMP

(ii) Virtual Terminal protocol

(iii) Email

(iv) UDP

(b) Explain in detail about the layers of OSI model? Compare OSI & TCP/IP network Reference models.

Q.7 (a) Compare circuit &Virtual circuit based packet switching in respect of queuing & Forwarding delays.

(b) Differentiate between

(i) Frequency modulation Vs Amplitude modulation

(ii) PAM Vs PCM

Q.8 (a) Explain Dijkstra’salgorithm with an example.

(b) What is DNS? How resources records and maintained in DNS?

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