CN |Gate-2010| Previous Year Questions| Set-11

Set-15 GATE-2006 CN

CN |Gate-2010| Computer Networks

  1. One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field? [GATE – 2010]

a. It can be used to prioritize packets
b. It can be used to reduce delays
c. It can be used to optimize throughput
d. It can be used to prevent packet looping

Answer : d)                


  1. Which one of the following is not a client server application? [GATE – 2010]

a. Internet chat
b. Ping
c. Web browsing
d. E-mail

Answer : b)


  1. Suppose computers A and B have IP addresses 10.105.1.113 and 10.105.1.91 respectively and they both use the same net mask N. Which of the values of N given below should not be used if A and B should belong to the same network? [GATE – 2010]

a. 255.255.255.224
b. 255.255.255.128
c. 255.255.255.0
d. 255.255.255.192

Answer : a)


  1. Consider a network with 6 routers R1 to R6 connected with links having weights as shown in the following diagram: 

 All the routers use the distance vector based routing algorithm to update their routing tables. Each router starts with its routing table initialized to contain an entry for each neighbour with the weight of the respective connecting link. After all the routing tables stabilize, how many links in the network will never be used for carrying any data?  [GATE – 2010]

a. 0
b. 1
c. 2
d. 3

Answer : c)
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