- 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.
uRPF uses the FIB (CEF) for lookups, it can operate in strict or loose mode, and it is applied per interface. The other options are false: uRPF does not inspect the destination address (only source), and it is not used for multicast traffic.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
- ✓
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
Static NAT maps one inside address to one outside address.
- ✓
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
Static NAT maps one inside address to one outside address.
- ✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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IPv6 Traffic Filtering and uRPF — study guide chapter
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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 — Static NAT maps one inside address to one outside address..
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. — uRPF uses the FIB (CEF) for lookups, it can operate in strict or loose mode, and it is applied per interface. The other options are false: uRPF does not inspect the destination address (only source), and it is not used for multicast traffic.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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Last reviewed: Jun 18, 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.
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