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300-410 Practice Question: Which THREE statements about IPv6 unicast RPF…
Which THREE statements about IPv6 unicast RPF (uRPF) are true? (Choose THREE.)
⚠ Common exam trap
Cisco often tests the distinction between source and destination address checking, leading candidates to incorrectly select that uRPF checks the destination address, when in fact it always validates the source address against the FIB.
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
✓
IPv6 uRPF uses the Forwarding Information Base (FIB) to verify source address reachability.
IPv6 unicast RPF (uRPF) leverages the Forwarding Information Base (FIB) to verify that the source address of an incoming packet is reachable via the interface on which the packet was received. The FIB contains the best routes from the routing table, and uRPF performs a reverse path lookup against it to ensure the source address is topologically correct. 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.
- ✓
IPv6 uRPF uses the Forwarding Information Base (FIB) to verify source address reachability.
Why this is correct
Correct: uRPF checks the FIB to see if the source address is reachable via the incoming interface.
- ✓
IPv6 uRPF can be configured in strict mode or loose mode.
Why this is correct
Correct: Strict mode requires the source to be reachable via the exact incoming interface; loose mode only requires a route to the source.
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IPv6 uRPF is configured on a per-interface basis.
Why this is correct
Correct: The 'ipv6 verify unicast source reachable-via' command is applied per interface.
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IPv6 uRPF checks the destination address of incoming packets.
Why it's wrong here
uRPF checks the source address, not the destination.
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IPv6 uRPF is used to filter multicast traffic.
Why it's wrong here
uRPF is for unicast traffic only; multicast uses different mechanisms (e.g., RPF for multicast routing).
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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.