Question 1,843 of 2,011
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 tunnel 0
Tunnel0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1 Global unicast address(es): 2001:DB8:2::1, subnet is 2001:DB8:2::/64 Joined group address(es): FF02::1 FF02::2 ICMP redirects are enabled ICMP unreachables are enabled ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds IPv6 uRPF: loose 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 uRPF strict and loose modes by showing output that includes 'loose mode' or 'allow default route', and the trap here is that candidates may confuse 'loose mode' with 'disabled' or incorrectly assume that uRPF only applies to IPv4, ignoring the IPv6-specific output.
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 output explicitly shows 'IPv6 uRPF: loose mode (allow default route)', which confirms that unicast Reverse Path Forwarding (uRPF) is enabled in loose mode. In loose mode, the router checks that the source address of an incoming packet has a matching entry in the routing table, but it does not require the incoming interface to match the best return path. This is distinct from strict mode, which requires both a routing table entry and that the incoming interface is the same as the outgoing interface for the return route.
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, not strict.
- ✓
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.
Visual reference
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.