Ref: IPv6 First-Hop Security Configuration Guide, Cisco IOS XE Release 3S
“C H A P T E R 1
IPv6 RA Guard
…
Restrictions for IPv6 RA Guard
…
• The IPv6 RA Guard feature does not offer protection in environments where IPv6 traffic is tunneled.
…”
A. It does not offer protection in environments where IPv6 traffic is tunneled.
Correct answer.
B. It cannot be configured on a switch port interface in the ingress direction.
Wrong answer.
C. Packets that are dropped by IPv6 RA Guard cannot be spanned.
Wrong answer.
D. It is not supported in hardware when TCAM is programmed.
Wrong answer.
C is definately wrong. Packets dropped by the IPv6 RA Guard feature can be spanned
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-s/ip6f-15-s-book/ip6-ra-guard.pdf
upvoted 4 times
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