Which of the following ICMP message types are used for destinations unreachables?

A.
0

B.
3

C.
11

D.
13

E.
17

Explanation:
Type 3 messages are used for unreachable messages. 0 is Echo Reply,8 is Echo request,11 is
time exceeded,13 is timestamp and 17 is subnet mask request. Learning these would be
advisable for the test.