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300-410 Practice Question: Examine the following IPv6 ACL applied to an…
Examine the following IPv6 ACL applied to an interface:
ipv6 access-list FILTER
permit ipv6 any any fragments deny ipv6 any any interface GigabitEthernet0/1
ipv6 traffic-filter FILTER in
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that 'permit ipv6 any any' without the 'fragments' keyword matches all packets, but here the 'fragments' keyword narrows the match, causing candidates to overlook the sequential processing of ACL entries and incorrectly assume all traffic is permitted.
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
✓
Only fragmented IPv6 packets are permitted; all other IPv6 traffic is denied.
The ACL explicitly permits only fragmented IPv6 packets via the 'permit ipv6 any any fragments' statement, while the subsequent 'deny ipv6 any any' statement denies all other IPv6 traffic. Since ACLs are processed sequentially, the permit for fragments is evaluated first, allowing only fragmented packets; all non-fragmented packets are then denied by the second entry.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All IPv6 traffic is permitted because the permit statement matches any packet.
Why it's wrong here
The 'fragments' keyword matches only non-initial fragments; initial and non-fragmented packets are not matched by this entry.
- ✓
Only fragmented IPv6 packets are permitted; all other IPv6 traffic is denied.
Why this is correct
The first ACE permits only fragments; the second denies everything else, so only fragments pass.
- ✗
The ACL is invalid because 'fragments' cannot be used with 'any any'.
Why it's wrong here
The 'fragments' keyword is valid with IPv6 ACLs and can be used with any source/destination.
- ✗
The interface command is missing the 'ipv6 enable' prerequisite.
Why it's wrong here
The 'ipv6 traffic-filter' command does not require 'ipv6 enable' on the interface; it works as long as IPv6 is configured.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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