Semester
Subject
Year
Credit:
Eli Tamang
Eli TamangTribhuwan University
Institute of Science and Technology
2082
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.
What are the services provided by Data Link Layer? A channel has a bandwidth of 5 MHz and a signal-to-noise ratio of 1000. Calculate the Shannon Capacity. [6+4]
2.
Differentiate between packet and circuit switched network. Explain the layers of OSI Reference Model in brief. [4+6]
3.
Why TCP is known as reliable protocol? Explain. Divide the network 192.168.1.0/24 into 8 subnets and find its subnet ID, subnet mask, broadcast address and network ranges of each. [2+8]
Section B
Short Answers Questions
Attempt any Eight questions.
[8*5=40]
4.
Write down the major difference between IPv4 and IPv6 protocol. [5]
5.
Explain Link State Routing with suitable example. [5]
6.
What is DHCP? Explain DNS name resolution process with suitable example. [1+4]
7.
Discuss different unguided transmission medium in brief. [5]
8.
Encode the bit stream 111001011 with: (i) Manchester (ii) NRZ-I and (iii) NRZ-L scheme. [5]
9.
A bit stream 11011001 is transmitted using a standard CRC method. The generator polynomial is . Show the actual bit string transmitted and show the error checking on the receiver side. [5]
10.
What are the major differences between noise, distortion and attenuation? [5]
11.
Briefly explain ALOHA and Slotted ALOHA protocol with suitable diagram. [5]
12.
Write Short notes on: Sliding Window Protocol HTTP Protocol [0+2.5+2.5]