CN |Gate-2011| Previous Year Questions| Set-10

Set-15 GATE-2006 CN

CN |Gate-2011| Computer Networks

  1. A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT [GATE – 2011]

a. block entire HTTP traffic during 9:00PM and 5:00AM
b. block all ICMP traffic
c. stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address
d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM

Answer : d)


  1. Consider a network with five nodes, N1 to N5 as shown below. 

The network a distance vector protocol. What is the routes Have stabilised, the distance vector a different notes are as follows N1:(0,1,7,8,4) N2:(1,0,6,7,3) N3:(7,6,0,2,6) N4:(8,7,2,0,4) N5:(4,3,6,4,0) The network uses a Distance Vector Routing protocol. Once the routes have stabilized, the distance vectors at different nodes are as following. N1: (0, 1, 7, 8, 4) N2: (1, 0, 6, 7, 3) N3: (7, 6, 0, 2, 6) N4: (8, 7, 2, 0, 4) N5: (4, 3, 6, 4, 0) Each distance vector is the distance of the best known path at the instance to nodes, N1 to N5, where the distance to itself is 0. Also, all links are symmetric and the cost is identical in both directions. In each round, all nodes exchange their distance vectors with their respective neighbors. Then all nodes update their distance vectors. In between two rounds, any change in cost of a link will cause the two incident nodes to change only that entry in their distance vectors. 52. The cost of link N2-N3 reduces to 2(in both directions). After the next round of updates, what will be the new distance vector at node, N3.  [GATE – 2011]

a. (3, 2, 0, 2, 5)
b. (3, 2, 0, 2, 6)
c. (7, 2, 0, 2, 5)
d. (7, 2, 0, 2, 6)

Answer : a)


  1. Consider a network with five nodes, N1 to N5m as show below. 

The network a distance vector protocol. What is the routes Have stabilised, the distance vector a different notes are as follows N1:(0,1,7,8,4) N2:(1,0,6,7,3) N3:(7,6,0,2,6) N4:(8,7,2,0,4) N5:(4,3,6,4,0)      [GATE – 2011]

a. 3
b. 9
c. 10
d. ∞

Answer : c)
CN |Gate-2011|


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