Quick Answer
The correct answer is that the 'vrf CUSTOMER' parameter filters the output of the show ip nat translations command to display only NAT entries associated with that specific VRF, enabling per-customer NAT. This is essential in MPLS VPN environments where multiple customers share the same router but require isolated address spaces and independent NAT policies; without the VRF keyword, the command would show all translations across all VRFs, mixing customer data. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of VRF-aware NAT, often appearing in scenarios where you must verify that NAT is correctly translating traffic for a single customer without affecting others. A common trap is forgetting that the VRF parameter is mandatory when NAT is configured inside a VRF—omitting it may show no output or incorrect translations. Memory tip: think of "VRF as a private room"—the parameter lets you peek into only one customer’s translation table, keeping their traffic separate from the rest.
This 300-410 practice question tests your understanding of nat and pat. 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 NAT on a VRF:
R1# show ip nat translations vrf CUSTOMER
Pro Inside global Inside local Outside local Outside global --- 10.2.2.2 10.1.1.1 192.168.1.1 192.168.1.1
What is the purpose of the 'vrf CUSTOMER' parameter?
It filters translations for a specific VRF, allowing per-customer NAT.
VRF-aware NAT is used to translate addresses for different customers.
It shows all translations across all VRFs.
Why wrong: The command shows only the specified VRF.
It enables NAT on the VRF interface.
Why wrong: The command is for verification, not configuration.
It creates a new VRF for NAT.
Why wrong: No creation is done.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It filters translations for a specific VRF, allowing per-customer NAT.
This shows NAT translations specific to a VRF, used in MPLS VPN environments where NAT is applied per VRF.
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
For each option: why learners choose it and why it is or isn't the right answer here.
It filters translations for a specific VRF, allowing per-customer NAT.
It shows all translations across all VRFs.
Why it's wrong here
The command shows only the specified VRF.
It enables NAT on the VRF interface.
Why it's wrong here
The command is for verification, not configuration.
It creates a new VRF for NAT.
Why it's wrong here
No creation is done.
Common exam traps
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
The command shows only the specified VRF.
Detailed technical explanation
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.
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
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
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
NAT and PAT — This question tests NAT and PAT — Static NAT maps one inside address to one outside address..
The correct answer is: It filters translations for a specific VRF, allowing per-customer NAT. — This shows NAT translations specific to a VRF, used in MPLS VPN environments where NAT is applied per VRF.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 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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