A device that has enabled the DF bit in the IP header is unable to send traffic to a specific destination that it was able to reach before. What is the likely problem?

A) Incorrect destination IP address
B) Incorrect subnet mask
C) MTU mismatch
D) Incorrect subnet identifier


C
Explanation: The Don't Fragment (DF) bit is set in the IP header, which means that routers along the path to the destination are not allowed to fragment the packet when a configured MTU is too small to forward the traffic. When this happens, that router cannot forward the traffic and ends up dropping the packet and sending back an ICMP "Destination unreachable" message indicating that the DF bit must be disabled.

Computer Science & Information Technology

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