mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 interface gigabitethernet 0/0 | include uRPF
IPv6 uRPF: strict mode (allow default route)
Based on this output, what is the uRPF configuration on this interface?
⚠ Common exam trap
Cisco often tests the distinction between strict and loose uRPF modes, and the trap here is that candidates may overlook the 'allow default route' phrase and incorrectly assume that strict mode always drops packets matching a default route, or they may confuse strict mode with loose mode when the output explicitly states 'strict'.
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
✓
uRPF is enabled in strict mode with allow-default
The command output explicitly shows 'IPv6 uRPF: strict mode (allow default route)', which confirms that uRPF is enabled in strict mode with the allow-default option. This configuration validates that the source address of incoming packets must have a matching route in the FIB pointing back to the same interface, and the allow-default keyword permits the use of a default route as a valid reverse path, which is necessary in scenarios where a default route is the only route to the source.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
uRPF is disabled
Why it's wrong here
The output shows uRPF is enabled.
- ✓
uRPF is enabled in strict mode with allow-default
Why this is correct
The output confirms strict mode uRPF with the allow-default option.
- ✗
uRPF is enabled in loose mode
Why it's wrong here
The output specifies strict mode.
- ✗
uRPF is enabled but only for multicast
Why it's wrong here
uRPF applies to unicast traffic.
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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.