- A
IPv6 uRPF uses the Forwarding Information Base (FIB) to verify source address reachability.
Correct: uRPF checks the FIB to see if the source address is reachable via the incoming interface.
- B
IPv6 uRPF can be configured in strict mode or loose mode.
Correct: Strict mode requires the source to be reachable via the exact incoming interface; loose mode only requires a route to the source.
- C
IPv6 uRPF is configured on a per-interface basis.
Correct: The 'ipv6 verify unicast source reachable-via' command is applied per interface.
- D
IPv6 uRPF checks the destination address of incoming packets.
Why wrong: uRPF checks the source address, not the destination.
- E
IPv6 uRPF is used to filter multicast traffic.
Why wrong: uRPF is for unicast traffic only; multicast uses different mechanisms (e.g., RPF for multicast routing).
300-410 IPv6 Traffic Filtering and uRPF Practice Question
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE statements about IPv6 unicast RPF (uRPF) are true? (Choose THREE.)
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.
Option A is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
IPv6 uRPF checks the destination address of incoming packets.
Why it's wrong here
uRPF checks the source address, not the destination.
- ✗
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).
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
IPv6 uRPF operates by performing a FIB lookup on the source IP address of each incoming packet; if the best return route to that source does not point back to the ingress interface, the packet is dropped. In strict mode, the source must be reachable exactly via the receiving interface, while loose mode only requires a route to the source to exist in the FIB, regardless of the interface. This feature is configured per interface using the 'ipv6 verify unicast source reachable-via' command, and it is commonly deployed at network edge to mitigate source address spoofing attacks.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: IPv6 uRPF uses the Forwarding Information Base (FIB) to verify source address reachability. — Option A is correct because 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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