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.
300-410 IPv6 Traffic Filtering and uRPF Practice Question
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)
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.
The output shows the number of packets matching each entry. Sequence 10 has 10 matches, sequence 20 has 5 matches (denied), and sequence 30 has 100 matches (permitted).
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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
Standard ACLs match source addresses.
✗
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: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
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
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Standard ACLs match source addresses..
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. — The output shows the number of packets matching each entry. Sequence 10 has 10 matches, sequence 20 has 5 matches (denied), and sequence 30 has 100 matches (permitted).
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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