GATE | GATE CS 2020 | Question 25

Consider the following statements about the functionality of an IP based router.

I. A router does not modify the IP packets during forwarding.
II. It is not necessary for a router to implement any routing protocol.
III. A router should reassemble IP fragments if the MTU of the outgoing link is larger than the size of the incoming IP packet.

Which of the above statements is/are TRUE ?
(A) I and II only
(B) I only
(C) II and III only
(D) II only

Answer: (D)
Explanation:

I. False. A router modifies the IP packets during forwarding because TTL (Time to Live) is changing.
II. True. A router need not implement any routing protocol. It can just forward packets in all the directions without doing any routing.
III. False. Router does not assemble the packets. Assembling is done at destination system.

Option (D) is correct.
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