- A
A TCP packet from 2001:DB8:2::1 to destination 2001:DB8:3::1 port 80 was denied by the access list.
Correct. The log clearly indicates the denied packet details.
- B
A TCP packet was permitted by the access list.
Why wrong: Incorrect. The log says 'denied'.
- C
The access list is not applied to any interface.
Why wrong: Incorrect. The log shows it is active and filtering.
- D
The packet was dropped due to uRPF.
Why wrong: Incorrect. The log references the access list, not uRPF.
Question 1,908 of 2,152
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 traffic filtering with logging:
R1# show logging | include FILTER *Mar 1 00:04:56.789: %IPV6_ACL-6-ACCESSLOGDP: list FILTER denied tcp 2001:DB8:2::1(12345) -> 2001:DB8:3::1(80), 1 packet
What does this output indicate?
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
✓
A TCP packet from 2001:DB8:2::1 to destination 2001:DB8:3::1 port 80 was denied by the access list.
The log message shows an IPv6 ACL (named FILTER) logging a denied TCP packet from source 2001:DB8:2::1 port 12345 to destination 2001:DB8:3::1 port 80. The keyword 'denied' in the log entry confirms the packet was blocked by the access list, making option A correct.
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.
- ✓
A TCP packet from 2001:DB8:2::1 to destination 2001:DB8:3::1 port 80 was denied by the access list.
Why this is correct
Correct. The log clearly indicates the denied packet details.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A TCP packet was permitted by the access list.
Why it's wrong here
Incorrect. The log says 'denied'.
- ✗
The access list is not applied to any interface.
Why it's wrong here
Incorrect. The log shows it is active and filtering.
- ✗
The packet was dropped due to uRPF.
Why it's wrong here
Incorrect. The log references the access list, not uRPF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the ability to distinguish between ACL deny/permit actions in log messages, where the trap is that candidates misread 'denied' as 'permitted' or confuse ACL logging with other features like uRPF or interface statistics.
Trap categories for this question
Command / output trap
Incorrect. The log shows it is active and filtering.
Detailed technical explanation
How to think about this question
The log format %IPV6_ACL-6-ACCESSLOGDP includes the ACL name (FILTER), action (denied), protocol (tcp), source/destination addresses and ports, and packet count. IPv6 ACLs use implicit deny at the end, so if no permit entry matches, the packet is denied and logged if the log keyword is configured on the ACL entry. In real-world scenarios, this helps troubleshoot why traffic to a web server (port 80) from a specific host is being blocked, often due to missing permit statements or incorrect sequence ordering.
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: A TCP packet from 2001:DB8:2::1 to destination 2001:DB8:3::1 port 80 was denied by the access list. — The log message shows an IPv6 ACL (named FILTER) logging a denied TCP packet from source 2001:DB8:2::1 port 12345 to destination 2001:DB8:3::1 port 80. The keyword 'denied' in the log entry confirms the packet was blocked by the access list, making option A correct.
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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