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AR427 incorrect answer - yardbyrd - 03-31-2025
The correct answer should be "IPv6 Prefix Guard".
IPv6 Prefix Guard is used on ingress interfaces to deny access to traffic that has a correct address but that is not topologically correct. The feature discovers ranges of addresses that have been assigned to a link and blocks any traffic sourced with an address outside that range, ensuring that traffic is sourced from its assigned location.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-3/configuration_guide/sec/b_173_sec_9300_cg/configuring_ipv6_first_hop_security.html#:~:text=The%20IPv6%20DHCP%20Guard%20feature,dhcp%2Dguard%20privileged%20EXEC%20command.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/xe-16/ip6f-xe-16-book/ip6-src-guard.pdf#:~:text=The%20IPv6%20Prefix%20Guard%20feature%20enables%20a,previously%20learned%20through%20ND%20or%20DHCP%20gleaning.
RE: AR427 incorrect answer - help_desk - 03-31-2025
The question has been corrected. Thank you!