The answer is that no IPv6 packets have been dropped by uRPF checks. This is because the output from the `show ipv6 traffic | include verify` command displays two key counters: "verify source drops" and "verify source suppressed drops," and both are zero. The first counter tracks packets that failed the strict or loose unicast Reverse Path Forwarding (uRPF) check, while the second counts packets that were suppressed from verification due to features like allow-default or allow-none. On the Cisco CCNP ENARSI 300-410 exam, this command is used to validate uRPF operation after configuration, and a common trap is misinterpreting "suppressed drops" as actual drops—they are not; they indicate packets bypassed the check. A useful memory tip is to think of the two zeros as "zero drops, zero problems": if both counters show zero, your uRPF policy is either not seeing any spoofed traffic or is not configured to drop.
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 uRPF drops:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No IPv6 packets have been dropped by uRPF checks.
The output shows counters for uRPF drops. Both counters are zero, indicating no packets have been dropped due to uRPF verification.
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.
✓
No IPv6 packets have been dropped by uRPF checks.
Why this is correct
Correct. Zero drops indicate that all packets passed uRPF verification.
Related concept
Read the scenario before looking for a memorised answer.
✗
uRPF is not configured on any interface.
Why it's wrong here
Incorrect. The counters exist and show zero, but uRPF could be configured and passing traffic.
✗
uRPF is dropping all packets.
Why it's wrong here
Incorrect. Zero drops mean no drops.
✗
The router is not processing IPv6 traffic.
Why it's wrong here
Incorrect. The command shows traffic statistics; zero drops does not indicate no traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Incorrect. The counters exist and show zero, but uRPF could be configured and passing traffic.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: No IPv6 packets have been dropped by uRPF checks. — The output shows counters for uRPF drops. Both counters are zero, indicating no packets have been dropped due to uRPF verification.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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