Which implicit rules are applied to all IPv6 ACLs?
A. deny icmp any any nd-nadeny icmp any any nd-nspermit icmp any any router- advertisementpermit icmp any any router-solicitationdeny ipv6 any any
B. deny icmp any any router-advertisement logdeny icmp any a ny router-solicitation logdeny ipv6 any any log
C. deny icmp any any nd-na logdeny icmp any any nd-ns logdeny ipv6 any any log
D. permit icmp any any nd-napermit icmp any any nd-nspermit icmp any any routeradvertisementpermit icmp any any router- solicitationdeny ipv6 any any
On top of my previous comment:
If you explicitly configure an IPv6 ACL with a deny ipv6 any any rule, the implicit permit rules can never permit traffic. If you explicitly configure a deny ipv6 any any rule but want to permit ICMPv6 neighbor discovery messages, explicitly configure a rule for all five implicit rules.
All IPv6 ACLs include the following implicit rule:
permit icmp any any nd-na
permit icmp any any nd-ns
permit icmp any any router-advertisement
permit icmp any any router-solicitation
deny ipv6 any any