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 field.
If the destination is not reachable, which one of the following are generated?
A . Type 8 ICMP codes
B . Type 12 ICMP codes
C . Type 3 ICMP codes
D . Type 7 ICMP codes
Answer: C
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