The GATE Grind

GATE 2024 CS (CS2) – Question 28

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

Which of the following statements about IPv4 fragmentation is/are TRUE?

  1. The fragmentation of an IP datagram is performed only at the source of the datagram
  2. The fragmentation of an IP datagram is performed at any IP router which finds that the size of the datagram to be transmitted exceeds the MTU
  3. The reassembly of fragments is performed only at the destination of the datagram
  4. The reassembly of fragments is performed at all intermediate routers along the path from the source to the destination

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Show answer and explanation

Correct answer: (B) The fragmentation of an IP datagram is performed at any IP router which finds that the size of the datagram to be transmitted exceeds the MTU; (C) The reassembly of fragments is performed only at the destination of the datagram

Explanation

In IPv4, any router may fragment a datagram larger than the next link's MTU, but reassembly happens only at the destination host.