Intermediate
Computer Networks
Q73 / 100
How does Path MTU Discovery work and why does it matter?
Correct! Well done.
Incorrect.
The correct answer is C) It sends packets with the Don't Fragment bit set and uses ICMP "Fragmentation Needed" replies to find the smallest MTU along a path, avoiding costly IP fragmentation
C
Correct Answer
It sends packets with the Don't Fragment bit set and uses ICMP "Fragmentation Needed" replies to find the smallest MTU along a path, avoiding costly IP fragmentation
Explanation
A sender transmits with the Don't Fragment flag; if a router's outgoing link MTU is smaller, it drops the packet and returns an ICMP message reporting its MTU. The sender reduces packet size accordingly, avoiding fragmentation overhead and potential black holes.
Progress
73/100