- A
5 packets from 2001:DB8:2::/48 have been denied, and 110 packets have been permitted.
Correct. 5 matches on the deny entry, and 10+100=110 matches on permit entries.
- B
All packets from 2001:DB8:2::/48 have been permitted.
Why wrong: Incorrect. The deny entry has matches, indicating packets were denied.
- C
The access list has been applied to an interface but not used.
Why wrong: Incorrect. The match counters show it has been used.
- D
The access list is invalid because of the order of entries.
Why wrong: Incorrect. The order is valid; deny before permit any is common.
Question 1,337 of 2,152
Interpreting show ipv6 access-list Output
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to verify IPv6 access-list hits:
R1# show ipv6 access-list FILTER | include matches
permit ipv6 2001:DB8:1::/48 any sequence 10 (10 matches)
deny ipv6 2001:DB8:2::/48 any sequence 20 (5 matches)
permit ipv6 any any sequence 30 (100 matches)What does this output indicate?
Quick Answer
The answer is that 5 packets from the 2001:DB8:2::/48 network have been denied, while a total of 110 packets have been permitted across the IPv6 access-list. This is correct because the show ipv6 access-list FILTER | include matches command displays the cumulative packet count for each Access Control Entry (ACE), where the sequence number indicates the order of evaluation and the number in parentheses shows how many packets have matched that specific rule. On the Cisco CCNP ENARSI 300-410 exam, interpreting show ipv6 access-list output tests your ability to verify traffic filtering and troubleshoot policy issues, often appearing in troubleshooting scenarios where you must confirm whether a deny statement is actually blocking traffic. A common trap is forgetting that the permit ipv6 any any entry at sequence 30 catches all remaining traffic, so the total permitted count includes both the explicit permit at sequence 10 (10 matches) and the implicit permit at sequence 30 (100 matches). A useful memory tip is to remember that "matches" are cumulative counters that never reset unless the access-list is cleared, so always add the permit entries separately from the deny entries when calculating total permitted traffic.
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
✓
5 packets from 2001:DB8:2::/48 have been denied, and 110 packets have been permitted.
Option A is correct because the output shows the hit counts for each ACL entry: sequence 10 has permitted 10 packets from 2001:DB8:1::/48, sequence 30 has permitted 100 packets from any source, and sequence 20 has denied 5 packets from 2001:DB8:2::/48. The total permitted packets are 10 + 100 = 110, and the denied count is 5, matching the statement in A.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
5 packets from 2001:DB8:2::/48 have been denied, and 110 packets have been permitted.
Why this is correct
Correct. 5 matches on the deny entry, and 10+100=110 matches on permit entries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
All packets from 2001:DB8:2::/48 have been permitted.
Why it's wrong here
Incorrect. The deny entry has matches, indicating packets were denied.
- ✗
The access list has been applied to an interface but not used.
Why it's wrong here
Incorrect. The match counters show it has been used.
- ✗
The access list is invalid because of the order of entries.
Why it's wrong here
Incorrect. The order is valid; deny before permit any is common.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that hit counts on a deny entry mean the traffic was permitted, but in reality, the hit count indicates how many packets matched that deny rule and were dropped.
Trap categories for this question
Command / output trap
Incorrect. The match counters show it has been used.
Detailed technical explanation
How to think about this question
IPv6 ACLs process entries in sequence order, and the first match is applied; the 'matches' counter increments for each packet that matches a specific entry. In this output, the deny entry at sequence 20 is reached only if the source address does not match the earlier permit for 2001:DB8:1::/48, ensuring that traffic from 2001:DB8:2::/48 is blocked while other traffic is permitted. This behavior is consistent with RFC 2460 and Cisco's implementation of IPv6 access-lists, where implicit deny any any is not shown but still applies at the end.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 5 packets from 2001:DB8:2::/48 have been denied, and 110 packets have been permitted. — Option A is correct because the output shows the hit counts for each ACL entry: sequence 10 has permitted 10 packets from 2001:DB8:1::/48, sequence 30 has permitted 100 packets from any source, and sequence 20 has denied 5 packets from 2001:DB8:2::/48. The total permitted packets are 10 + 100 = 110, and the denied count is 5, matching the statement in A.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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