Computer Networks, 2068 Baisakh - Old questions

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

Computer Networks, 2068 Baisakh

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. What is a switching? Differentiate between packet switching and circuit switching.
  • [4+4]
  • 2. What are types of twisted pair cable? Calculate the efficiency if slotted Aloha.
  • [2+6]
  • 3. What is a virtual LAN? Design a network which consists of two VLAN names student and department. Explain with necessary diagram, IP addresses and configurations.
  • [2+6]
  • 4. What is a logical address? You are given the IP address block 200.10.80.32/25. If there are five departments which require 5, 40, 28, 12, 6 hosts respectively. Design the subnet.
  • [3+5]
  • 5. What are the functions of transport layer? Draw the segment structure of TCP.
  • [3+5]
  • 6. What is a fragmentation and re-assembly? Explain about any intra-AS routing protocol.
  • [4+4]
  • 7. What are the advantages of IPV6? The maximum payload segment is 65495 byte. Why was such strange number chosen?
  • [3+5]
  • 8. What is the function of proxy server? Explain about electronic mail.
  • [2+6]
  • 9. What is a secure socket layer? Encrypt the message "DANGER" using RSA algorithm.
  • [6+2]
  • 10. Compare X.25 and frame relay network. A bit string 0111101111101111110 needs to be transmitted at the data link layer. What is the string actually transferred after bit stuffing?