The GATE Grind

GATE 2020 CS – Question 25

Computer Networks · IPv4: Addressing, CIDR, Fragmentation and NAT · 1 mark · Multiple choice

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?

  1. I and II only
  2. I only
  3. II and III only
  4. II only

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Show answer and explanation

Correct answer: (D) II only

Explanation

I is false since a router decrements TTL and recomputes the checksum. III is false since reassembly is done only at the destination. II is true because routers can use static routing.