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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: loose mode

Based on this output, what is the operational state of uRPF on this interface?

⚠ Common exam trap

Cisco often tests the distinction between 'loose mode' and 'strict mode' by presenting output that clearly states the mode, but candidates may confuse 'loose' with 'disabled' or incorrectly assume that any uRPF output implies strict mode.

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 loose mode

The command 'show ipv6 interface gigabitethernet 0/0 | include uRPF' returns 'IPv6 uRPF: loose mode', which directly indicates that unicast Reverse Path Forwarding (uRPF) is enabled and operating in loose mode on this interface. Loose mode checks only that a source address exists in the routing table, without requiring that the incoming interface matches the best return path.

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

    Why it's wrong here

    The output specifies loose mode.

  • ✓

    uRPF is enabled in loose mode

    Why this is correct

    The output confirms loose mode uRPF.

  • ✗

    uRPF is enabled but only for IPv4

    Why it's wrong here

    This is an IPv6 interface, and uRPF is configured for IPv6.

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JA

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.