51AH (Authentication Header) is part of the IPsec protocol suite, used to provide integrity and authentication for IP packets.It is defined by RFC 4302 and uses its own protocol number within the IP header.The protocol number for AH is officially assigned by IANA (Internet Assigned Numbers Authority).According to the IANA registry:Protocol Number for AH = 51This protocol number is used in the IP header’s “Protocol” field to indicate the next protocol is AH.Correct answer: 51
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[Reference:, IANA IP Protocol Numbers: https://www.iana.org/assignments/protocol-numbers, Huawei HCIE-Datacom V1.0 Study GuideChapter: IPsec FundamentalsSection: AH and ESP Protocol Details, , , , ]
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