51AH (Authentication Header)is part of theIPsec protocol suite, used to provideintegrity and authenticationfor IP packets.It is defined byRFC 4302and uses itsown protocol numberwithin the IP header.The protocol number for AH is officially assigned byIANA (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 isAH.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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