mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify IPv6 uRPF on…
A network engineer runs the following command to verify IPv6 uRPF on an interface:
R1# show ipv6 interface GigabitEthernet0/0 | include verify|suppress
IPv6 verify source: strict IPv6 verify source suppress: disabled
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between 'strict' and 'loose' uRPF modes, and the trap here is that candidates may confuse the 'suppress' keyword with disabling uRPF entirely, when in fact it only controls whether certain packets are exempt from the check.
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
✓
Strict uRPF is enabled, and no suppression is configured, so all incoming packets are subject to strict verification.
The output shows 'IPv6 verify source: strict' and 'IPv6 verify source suppress: disabled'. This confirms that strict unicast Reverse Path Forwarding (uRPF) is enabled on the interface, meaning every incoming packet's source address is checked against the routing table to ensure the best return route uses the same incoming interface. Because suppression is disabled, no packets bypass this verification, so all incoming packets are subject to strict uRPF checks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Strict uRPF is enabled, and no suppression is configured, so all incoming packets are subject to strict verification.
Why this is correct
Correct. Strict uRPF is active and no exceptions are configured.
- ✗
Loose uRPF is enabled with suppression.
Why it's wrong here
Incorrect. It says strict, not loose.
- ✗
uRPF is disabled on this interface.
Why it's wrong here
Incorrect. It shows enabled.
- ✗
Suppression is enabled, so uRPF checks are bypassed.
Why it's wrong here
Incorrect. Suppression is disabled.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.