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GATE | GATE-CS-2015 (Mock Test) | Question 4

Consider the following routing table of a router.

Prefix Next Hop
192.24.0.0/18 D
192.24.12.0/22 B

Consider the following three IP addresses.



Prefix
192.24.0.0/18
192.24.12.0/22
192.24.54.0

How are the packets with above three destination IP addresses are forwarded?

(A)



1->D, 2->B, 3->B

(B)

1->D, 2->B, 3->D

(C)

1->B, 2->D, 3->D

(D)

1->D, 2->D, 3->D


Answer: (B)
Explanation:

Option I matches the first and third IP addresses because they fall within the range defined by its subnet mask. Option II matches the second IP address because it falls within the range defined by its subnet mask. Option III doesn’t match any IP addresses as they fall outside the range defined by its subnet masks. So, the correct option is B.

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