Multiple choice

What ICMP response will be sent when the TTL expires?

  1. Destination Unreachable

  2. Source Quench

  3. Redirect Message

  4. Time exceeded

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When an IPv4 packet's Time to Live (TTL) field reaches zero, the router discards the packet and sends an ICMP 'Time Exceeded' message back to the source.