Questions
Syllabus
Qns. By Syllabus

Semester

Subject

Year

Tribhuwan University

Institute of Science and Technology

2080

Bachelor Level / Second Year / Fourth Semester / Science

Bachelors in Information Technology (BIT254)

(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 Answers Questions

Attempt any TWO questions.
[2*10=20]
1.
Differentiate between noise and attenuation. A pure ALOHA network transmits 200 bit frames using a shared channel with a 50 kbps bandwidth. What is the requirement to make this frame collision free?[10]
2.
What is Congestion Control? How can it be handled? Explain acknowledgement policy and discarding policy[10]
3.
What are the practical implications of OSI layer? Define each layer focusing on its functionality and hardware used in each layer[10]
Section B

Short Answers Questions

Attempt any Eight questions.
[8*5=40]
4.
Explain leaky-bucket algorithm with an example [5]
5.
Represent bit sequence 100111001 by the following wave forms: NRZ-L, NRZ-I [5]
6.
Explain link state routing protocol with an example [5]
7.
Explain recursive resolution. What are its advantages? [5]
8.
Calculate the transmitted encoded frame if the message sequence is 10010001 and generator polynomial is G(X) = $x^2 + x + 1$ [5]
9.
Explain the concept of TDMA with a neat diagram. [5]
10.
What is circuit switching? What are its advantages and disadvantages? [5]
11.
What is the difference between DNS and DHCP? Explain with example [5]
12.
Write short notes on Reliable Protocol and Satellite Network [5]