- A
No IPv6 packets have been dropped by uRPF checks.
Correct. Zero drops indicate that all packets passed uRPF verification.
- B
uRPF is not configured on any interface.
Why wrong: Incorrect. The counters exist and show zero, but uRPF could be configured and passing traffic.
- C
uRPF is dropping all packets.
Why wrong: Incorrect. Zero drops mean no drops.
- D
The router is not processing IPv6 traffic.
Why wrong: Incorrect. The command shows traffic statistics; zero drops does not indicate no traffic.
Question 1,054 of 2,152
IPv6 uRPF Drop Counters — show ipv6 traffic
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:
R1# show ipv6 traffic | include verify
0 verify source drops, 0 verify source suppressed drops
What does this output indicate?
Quick Answer
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.
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
✓
No IPv6 packets have been dropped by uRPF checks.
The output shows '0 verify source drops' and '0 verify source suppressed drops', which are the counters for IPv6 unicast Reverse Path Forwarding (uRPF) drops. Since both counters are zero, no IPv6 packets have been dropped by uRPF checks. This does not necessarily mean uRPF is not configured; it simply indicates that no packets have failed the uRPF verification process.
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
Cisco often tests the misconception that zero counters mean the feature is not configured, when in fact the feature may be configured and simply not dropping any packets.
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
IPv6 uRPF checks the source address of incoming packets against the FIB to ensure a return route exists via the same interface, preventing spoofing. The 'verify source suppressed drops' counter increments when uRPF is configured with the 'allow-default' or 'allow-none' keyword, which suppresses drops for packets matching a default route or no route, respectively. In real-world scenarios, zero drops could indicate either no spoofing attacks or that uRPF is not actively filtering due to permissive configuration.
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 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.
What to study next
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IPv6 Traffic Filtering and uRPF — study guide chapter
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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: No IPv6 packets have been dropped by uRPF checks. — The output shows '0 verify source drops' and '0 verify source suppressed drops', which are the counters for IPv6 unicast Reverse Path Forwarding (uRPF) drops. Since both counters are zero, no IPv6 packets have been dropped by uRPF checks. This does not necessarily mean uRPF is not configured; it simply indicates that no packets have failed the uRPF verification process.
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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