Computer Networks, 2068 Chaitra - Old questions

TRIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
Examination Control Division
Full Marks:
80
Pass Marks
30
Time
3 hrs.

Computer Networks, 2068 Chaitra

Candidates are required to give their answers in their own words as far as practicable.
Attempt All questions.
The figures in the margin indicate Full Marks
Assume suitable data if necessary
    [2+6]
  • 1. Why are the network softwares defined with distinct layers stacked on the top of one another? What are the factors to be considered when designing these layers?
  • [2+6]
  • 2. Why do we need RAID in the computer networks? Define and discuss the differences between RAID 0, RAID 1 and RAID 5.
  • [2+6]
  • 3. What is a telephone? With a simple diagram of a telephone network explain how the system works.
  • [3+7]
  • 4. Why channel access mechanism is important in the computer networking? Explain the operation of IEEE 802.5 with its frame format.
  • [2x5]
  • 5. Differentiate:
    a) Distance vector and link state routing algorithm.
    b) Circuit switching and packet switching
  • [3+5]
  • 6. What is X.25? Explain the format of X.25 packet in detail.
  • [3+5]
  • 7. What are the differences between TCP and UDP services? Explain the TCP datagram format in detail.
  • [10]
  • 8. Suppose there are 4 departments A, B, C and D. The department A has 23 hosts, B has 16, C has 28 and D has 13 hosts. You are given a networks 202.70.64.0/24. Perform subnetting in such a way that the IP address wastage in each department are minimum and also find out the subnet mask, network address, broadcast, and unable host range in each department.
  • [2x5]
  • 9. Write short notes on:
    a) Network Security
    b) Router and Gateway