Tribhuvan University
Bachelor of Information Technology
Semester 4 · TU Board 2080
Course Title: Network and Data Communications (BIT254)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable.
Group A
Attempt any Two questions.(2 × 10 = 20)
- 1.10
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?
- 2.10
What is Congestion Control? How can it be handled? Explain acknowledgement policy and discarding policy.
- 3.10
What are the practical implications of OSI layer? Define each layer focusing on its functionality and hardware used in each layer.
Group B
Attempt any Eight questions(8 × 5 = 40)
- 4.5
Explain leaky-bucket algorithm with an example.
- 5.5
Represent bit sequence 10011001 by the following wave form a. NRZ-L b. NRZ-I
- 6.5
Explain link state routing protocol with an example.
- 7.5
Explain recursive resolution. What are its advantages?
- 8.5
Calculate the transmitted encoded frame if the message sequence is 1001001 and generator polynomial is G(X) = x² + x + 1
Answer comingAlso asked in 2081, 2079
- 9.5
Explain the concept of TDMA with a neat diagram.
- 10.5
What is circuit switching? What are its advantages and disadvantages?
- 11.5
What is the difference between DNS and DHCP? Explain with example.
- 12.5
Write short notes a. Reliable Protocol b. Satellite Network
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