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…

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 a type field, code field, 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?