Question

A router has the following CIDR entries in its routing table: Address/mask 135.46.56.0/22 135.46.60.0/22 92.53.40.0/23 default Next hop Interface 0 Interface 1 Router 1 Router 2 What does the router do, if a packet arrives with each of the destination addresses given below? a. 135.46.63.10 b. 135.46.57.14 c. 135.46.52.2 d. 192.53.40.7 e. 192.53.56.7

Answer 1

A) 135.46.63.10 =====> Goes to Interface 1

See Explanation: Mask /22 means AND with 22 ones and rest 0's

Applying mask 22 we get ,
135.46. 001111 11.00001010 / 22 we get => 135.46.60.0

B) 135.46.57.14 =====> Goes to Interface 0

See Explanation: Mask /22 means AND with 22 ones and rest 0's

Applying mask 22 we get ,
135.46.00111001.00001110 / 22 we get => 135.46.56.0

C) 135.46.52. 2 =====> Goes to Router 2 as there is No match

See Explanation:

Mask /22 means AND with 22 ones and rest 0's

Applying mask 22 we get ,
135.46.00110100.00000010 / 22 we get => 135.46.52.0

D) 192.53.40.7 =====> Goes to Router 1

See Explanation: Mask /23 means AND with 23 ones and rest 0's

Applying mask 23 we get ,
192.53.00101000.00000111 / 23 we get => 192.53.40.0

E) 192.53.56.7 =====>Goes to Router 2 as there is No match

See Explanation: Mask /23 means AND with 23 ones and rest 0's

Applying mask 23 we get ,
192.53.00111000.00000111 / 23 we get => 192.53.56.0

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