BIT 4th Semester
Network and Data Communications Question Paper 2081

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BIT 254-2081 ✡
Tribhuvan University
Institute of Science and Technology
2081
✡
Bachelor Level/Second Year/Fourth Semester/Science
Bachelors in Information Technology (BIT 254)
(Network and Data Communications)
Full Marks:60 Pass Marks:24 Time:3 hours

Candidates are required to give their answers in their own words as for as practicable.
The figures in the margin indicate full marks

Section A
Long Answer Questions
Attempt any Two question.
[2x10=20]
1.

What are the features of Distance Vector Routing protocol? Explain Distance Vector Routing protocol with relevant example. What are its disadvantages?

2.

Explain the concept of Binary Phase Shift Keying. Represent bit sequence 111000110 by the following waveform
a. NRZ-I
b. Differential Manchester

3.

Explain the design of Selective Repeat ARQ. Illustrate it with suitable flow diagram example.

Section B

Attempt any Eight questions

[8x5=40]
4.

List different categories of networks and explain any two.

5.

What is SNMP and how does it work?

6.

What is MAC-address? The message sequence is 1011011 and generator polynomial G(X) = x³ + x² + 1. Calculate the transmitted encoded frame.

7.

How IGMP allows devices to join a multicast group? Explain.

8.

Differentiate between reliable and unreliable protocol. Provide example of each. How can these protocols be used?

9.

Explain different phases of packet switching. How packet switching works?

10.

Explain Frequency Division Multiplexing with required figure.

11.

A pure ALOHA network transmits 200-bit frames using a shared channel with a 200-kbps bandwidth. Find the throughput if the system considering all stations together produces 1000 frames per second. What do you mean by vulnerable time of pure ALOHA?

12.

Write short notes on
a. Shannon Capacity
b. Connectionless service