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300-410 Practice Question: Runs the following command to verify NAT on a…
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?
⚠ Common exam trap
Cisco often tests the distinction between filtering output and enabling a feature; the trap here is that candidates may think the 'vrf' parameter enables NAT on the VRF or creates a VRF, when in fact it only filters the display of existing translations.
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
✓
It filters translations for a specific VRF, allowing per-customer NAT.
The 'vrf CUSTOMER' parameter filters the output of 'show ip nat translations' to display only the NAT entries associated with the specified VRF (CUSTOMER). This allows per-customer NAT visibility in MPLS VPN or multi-VRF environments, where each VRF maintains its own separate NAT translation table. Without this parameter, the command would show all NAT translations across all VRFs, which is not the intended behavior.
Answer analysis
Option-by-option breakdown
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.
Why this is correct
VRF-aware NAT is used to translate addresses for different customers.
- ✗
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.
Visual reference
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Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 2 VPN
An MPLS Layer 2 VPN is a virtual private network technology that connects two or more customer sites at the data link layer, allowing them to communicate as if they were on the same local Ethernet segment, while using a service provider’s MPLS backbone.
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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