- A
Traffic from a valid source IP is being dropped on the interface.
uRPF drops packets when the source IP is not reachable via the incoming interface, even if the IP is valid.
- B
The router logs 'IPv6 unicast RPF drop' messages.
Syslog messages can indicate uRPF drops when logging is enabled.
- C
The command 'ipv6 verify unicast source reachable-via any' is present in the running config.
Why wrong: This is a configuration command, not a symptom of misconfiguration.
- D
High CPU utilization is observed due to RPF processing.
Why wrong: uRPF is typically performed in hardware (CEF) and does not cause high CPU.
- E
The 'show ipv6 interface' output shows an increasing 'RPF drops' counter.
The 'show ipv6 interface' command displays a counter for uRPF drops, indicating drops are occurring.
300-410 IPv6 Traffic Filtering and uRPF Practice Question
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE symptoms indicate that IPv6 unicast RPF is misconfigured or failing on an interface? (Choose THREE.)
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
Traffic from a valid source IP is being dropped on the interface.
uRPF drops packets if the source address is not reachable via the incoming interface. A syslog message about uRPF drops confirms this. The 'ipv6 verify unicast source reachable-via any' command is a configuration command, not a symptom. High CPU due to RPF checks is not typical; RPF is done in hardware (CEF). An increase in the 'ipv6_input' drop counter for 'RPF' indicates drops.
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.
- ✓
Traffic from a valid source IP is being dropped on the interface.
Why this is correct
uRPF drops packets when the source IP is not reachable via the incoming interface, even if the IP is valid.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The router logs 'IPv6 unicast RPF drop' messages.
Why this is correct
Syslog messages can indicate uRPF drops when logging is enabled.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The command 'ipv6 verify unicast source reachable-via any' is present in the running config.
Why it's wrong here
This is a configuration command, not a symptom of misconfiguration.
- ✗
High CPU utilization is observed due to RPF processing.
Why it's wrong here
uRPF is typically performed in hardware (CEF) and does not cause high CPU.
- ✓
The 'show ipv6 interface' output shows an increasing 'RPF drops' counter.
Why this is correct
The 'show ipv6 interface' command displays a counter for uRPF drops, indicating drops are occurring.
Related concept
Read the scenario before looking for a memorised answer.
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
This is a configuration command, not a symptom of misconfiguration.
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.
What to study next
Got this wrong? Here's your next step.
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.
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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: Traffic from a valid source IP is being dropped on the interface. — uRPF drops packets if the source address is not reachable via the incoming interface. A syslog message about uRPF drops confirms this. The 'ipv6 verify unicast source reachable-via any' command is a configuration command, not a symptom. High CPU due to RPF checks is not typical; RPF is done in hardware (CEF). An increase in the 'ipv6_input' drop counter for 'RPF' indicates drops.
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.
About these practice questions
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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