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300-410 Practice Question: Is troubleshooting IPv6 traffic filtering on a…
A network engineer is troubleshooting IPv6 traffic filtering on a Cisco router. Which TWO statements about IPv6 ACLs are true? (Choose TWO.)
⚠ Common exam trap
Watch out — candidates often assume IPv6 ACLs behave like IPv4 ACLs in supporting wildcard masks and remarks, or that they automatically permit essential control-plane traffic like ICMPv6 neighbor discovery, leading to incorrect selections of options B, D, or E.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPv6 ACLs are applied to interfaces using the ipv6 traffic-filter command.
The `ipv6 traffic-filter` command is the Cisco IOS command used to apply an IPv6 ACL to an interface for filtering inbound or outbound traffic. This is the direct IPv6 equivalent of the `ip access-group` command used for IPv4 ACLs, and it is the only valid method for applying IPv6 ACLs to filter traffic on a Cisco router interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IPv6 ACLs are applied to interfaces using the ipv6 traffic-filter command.
Why this is correct
Correct: The command is 'ipv6 traffic-filter' in interface configuration mode.
- ✗
IPv6 ACLs use wildcard masks similar to IPv4 ACLs.
Why it's wrong here
IPv6 ACLs use prefix-length notation, not wildcard masks.
- ✓
The implicit deny at the end of an IPv6 ACL also blocks ICMPv6 neighbor discovery messages.
Why this is correct
Correct: The implicit deny applies to all traffic, including ND; you must explicitly permit necessary ND messages.
- ✗
IPv6 ACLs automatically permit ICMPv6 neighbor discovery traffic by default.
Why it's wrong here
There is no automatic permit; you must explicitly configure it.
- ✗
IPv6 ACLs support the remark keyword for documentation.
Why it's wrong here
The 'remark' keyword is not supported in classic IOS IPv6 ACLs (it is available in some IOS-XE versions, but not universally).
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