According to RFC 1121, what should be done with a datagram that has an invalid IP version?

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Multiple Choice

According to RFC 1121, what should be done with a datagram that has an invalid IP version?

Explanation:
Invalid IP version means the version field in the header isn’t a recognized protocol version, so the host cannot interpret or process the datagram. RFC 1122 specifies that such datagrams should be discarded without sending any error notification. Since the header cannot be understood, there’s no valid way to route, reassemble, or generate a meaningful ICMP message. Dropping it silently prevents misuse of ICMP feedback and avoids attempting to process an unintelligible packet.

Invalid IP version means the version field in the header isn’t a recognized protocol version, so the host cannot interpret or process the datagram. RFC 1122 specifies that such datagrams should be discarded without sending any error notification. Since the header cannot be understood, there’s no valid way to route, reassemble, or generate a meaningful ICMP message. Dropping it silently prevents misuse of ICMP feedback and avoids attempting to process an unintelligible packet.

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