Questions
Syllabus
Qns. By Syllabus

Semester

Subject

Year

Tribhuwan University

Institute of Science and Technology

2079

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.
Explain the concept of Binary Amplitude Shift Keying. Represent bit sequence 11001010 by the following waveform a.) Manchester b.) Differential Manchester[10]
2.
Explain the design of Stop-and-Wait ARQ. Illustrate with suitable flow diagram example[10]
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?[10]
Section B

Short Answers Questions

Attempt any Eight questions.
[8*5=40]
4.
Differentiate between switch, router, and hub. [5]
5.
What are the major differences between noise, distortion and attenuation? [5]
6.
A ALOHA network transmits 200-h bit frames using a shared channel with 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? [5]
7.
Why do we use NAT? Explain its different types [5]
8.
Describe Quality of Service. What are its practical significances? [5]
9.
What is FTP and how does it work? [5]
10.
Explain Time Division Multiplexing with required figure [5]
11.
What is MAC-address? The message sequence is 1101011011 and generator polynomial G(X) = $x^3 + x + 1$. Calculate the transmitted encoded frame [5]
12.
Write short notes on Open-loop and POP. [5]