Clement is running a sniffer while performing a scan. He noticed a few ICMP Type 3 Code 13 messages. What does this mean?
A) Timestamp requests
B) Administratively prohibited
C) Destination unreachable, the network is down
D) Time to live has expired

Question

Quizplus · Accepted Answer

Type 3 is destination unreachable. There are several reasons this could be the case, so the codes are used to modify the type. In this case, a code 13 is administratively prohibited, likely sent back from a firewall that dropped the packet.

Clement Is Running a Sniffer While Performing a Scan