BIT 4th Semester
Network and Data Communications Question Paper 2079

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BIT 254-2079 ✡
Tribhuvan University
Institute of Science and Technology
2079
✡
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.

Explain the concept of Binary Amplitude Shift Keying. Represent bit sequence 110010110 by the following waveform
a. Manchester
b. Differential Manchester

2.

Explain the design of Stop-and-Wait ARQ. Illustrate it with suitable flow diagram example.

3.

What are the features of Link State routing protocols. Explain how Link State routing protocol can be used to find the shortest path with relevant example. What are its disadvantages.

Section B

Attempt any Eight questions

[8x5=40]
4.

Differentiate between switch, router, and hub.

5.

What are the major differences between noise, distortion and attenuation?

6.

A slotted 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 250 frames per second. What do you mean by vulnerable time of slotted ALOHA?

7.

Why do we use NAT? Explain its different types.

8.

Describe Quality of Service. What are its practical significances?

9.

What is FTP and how does it work?

10.

Explain Time Division Multiplexing with required figure.

11.

What is MAC-address? The message sequence is 1101011011 and generator polynomial G(X) = x4+x+1. Calculate the transmitted encoded frame.

12.

Write short notes on:
a. Open-loop
b. POP