2 Comments on “Which ICMP message type is used to assist path MTU discovery?”

1. Scooby says:

   November 27, 2015 at 9:59 pm

   Answer is A

   
   
   
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2. Vad says:

   May 12, 2016 at 5:51 pm

   When a router is unable to forward a datagram because it exceeds the
   MTU of the next-hop network and its Don’t Fragment bit is set, the
   router is required to return an ICMP Destination Unreachable message
   to the source of the datagram, with the Code indicating
   “fragmentation needed and DF set”.

   
   
   
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