Internet Control Message Protocol (ICMP) messages occur in many situations, such as
whenever a datagram cannot reach the destination or the gateway does not have the
buffering capacity to forward a datagram. Each ICMP message contains three fields: type,
code, and checksum. Different types of Internet Control Message Protocols (ICMPs) are
identified by a type and code field.
Which of the following ICMP messages will be generated if the destination port is not reachable?
A.
ICMP Type 11 code 1
B.
ICMP Type 5 code 3
C.
ICMP Type 3 code 2
D.
ICMP Type 3 code 3