- A
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.
Correct. Strict uRPF requires both a matching route and that the interface used to reach the source is the same as the receiving interface.
- B
Strict uRPF is enabled, but it only checks if the source address is in the routing table, regardless of interface.
Why wrong: Incorrect. Strict uRPF checks both the route and the interface; loose uRPF only checks the route.
- C
Loose uRPF is enabled, which only checks if the source address is in the routing table.
Why wrong: Incorrect. The output explicitly says 'strict'.
- D
uRPF is disabled on this interface.
Why wrong: Incorrect. The output shows it is enabled with strict mode.
300-410 IPv6 Traffic Filtering and uRPF Practice Question
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
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?
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 shows that strict uRPF (unicast Reverse Path Forwarding) is enabled on interface GigabitEthernet0/0. This means the router will check that the source address of incoming IPv6 packets is reachable via the same interface on which the packet arrived.
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.
- ✓
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.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
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.
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.
Trap categories for this question
Command / output trap
Incorrect. The output explicitly says 'strict'.
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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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: 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 shows that strict uRPF (unicast Reverse Path Forwarding) is enabled on interface GigabitEthernet0/0. This means the router will check that the source address of incoming IPv6 packets is reachable via the same interface on which the packet arrived.
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.
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Last reviewed: Jun 18, 2026
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