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
Based on this output, which statement is true?
⚠ Common exam trap
Cisco often tests the distinction between strict and loose uRPF modes, and the trap here is that candidates might confuse the 'strict mode' output with 'loose mode' or assume uRPF is disabled when the output line is present.
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
The command output explicitly shows 'IPv6 uRPF: strict mode', which confirms that unicast Reverse Path Forwarding (uRPF) is enabled and operating in strict mode. In strict mode, the router verifies that the source address of an incoming packet matches a route in the FIB and that the incoming interface is the same as the outgoing interface for that route. This prevents spoofed traffic from entering the network.
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 clearly shows uRPF is enabled.
- ✓
uRPF is enabled in strict mode
Why this is correct
The output confirms strict mode uRPF.
- ✗
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.