mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify IPv6 uRPF…
A network engineer runs the following command to verify IPv6 uRPF operation:
R1# show ipv6 interface GigabitEthernet0/0 | include verify
IPv6 verify source: strict
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between strict and loose uRPF by showing the 'verify source' output and expecting candidates to remember that 'strict' requires both a routing table match and the correct incoming interface, while 'loose' only requires the source to be in the routing table.
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, so the router will drop packets if the source address is not in the routing table or if the best return path is not through the receiving interface.
The output 'IPv6 verify source: strict' indicates that strict unicast Reverse Path Forwarding (uRPF) is enabled on the interface. Strict uRPF verifies that the source IPv6 address of an incoming packet is reachable via the routing table AND that the best return path to that source uses the same interface on which the packet was received. If either condition fails, the packet is dropped. This matches option A exactly.
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, so the router will drop packets if the source address is not in the routing table or if the best return path is not through the receiving interface.
Why this is correct
Correct. Strict uRPF requires both a matching route and that the interface used to reach the source is the same as the receiving interface.
- ✗
Strict uRPF is enabled, but it only checks if the source address is in the routing table, regardless of interface.
Why it's wrong here
Incorrect. Strict uRPF checks both the route and the interface; loose uRPF only checks the route.
- ✗
Loose uRPF is enabled, which only checks if the source address is in the routing table.
Why it's wrong here
Incorrect. The output explicitly says 'strict'.
- ✗
uRPF is disabled on this interface.
Why it's wrong here
Incorrect. The output shows it is enabled with strict mode.
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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.