BIT 4th Semester
Network and Data Communications Question Paper 2080

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BIT 254-2080 ✡
Tribhuvan University
Institute of Science and Technology
2080
✡
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.

Differentiate between noise and attenuation. A pure ALOHA network transmits 200 bit frames using shared channel with a 50 kbps bandwidth. What is the requirement to make this frame collision free?

2.

What is Congestion Control? How can it be handled? Explain acknowledgement policy and discarding policy.

3.

What are the practical implications of OSI layer? Define each layer focusing on its functionality and hardware used in each layer.

Section B

Attempt any Eight questions

[8x5=40]
4.

Explain leaky-bucket algorithm with an example.

5.

Represent bit sequence 10011001 by the following wave form
a. NRZ-L
b. NRZ-I

6.

Explain link state routing protocol with an example.

7.

Explain recursive resolution. What are its advantages?

8.

Calculate the transmitted encoded frame if the message sequence is 1001001 and generator polynomial is G(X) = x² + x + 1

9.

Explain the concept of TDMA with a neat diagram.

10.

What is circuit switching? What are its advantages and disadvantages?

11.

What is the difference between DNS and DHCP? Explain with example.

12.

Write short notes
a. Reliable Protocol
b. Satellite Network