The correct statement is that the VRF CUSTOMER is configured with two subinterfaces. This is evident from the show ip vrf output interpretation, which lists Gi0/0.100 and Gi0/1.100 under the Interfaces column; the .100 suffix clearly identifies these as subinterfaces rather than physical interfaces, and the default route distinguisher of 65001:100 is applied to both. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to read VRF configuration details quickly, often appearing in troubleshooting scenarios where a candidate must distinguish between physical interfaces and subinterfaces assigned to a VRF. A common trap is assuming that any interface listed is a physical port, but the decimal notation is a dead giveaway for subinterfaces. Memory tip: think of the dot as a “decimal divider” — if you see a dot after the interface number, you are looking at a subinterface, not a physical link.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. 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 on Router R1:
R1# show ip vrf CUSTOMER
Name Default RD Interfaces
CUSTOMER 65001:100 Gi0/0.100
Gi0/1.100
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VRF CUSTOMER is configured with two subinterfaces.
The output of 'show ip vrf CUSTOMER' displays the VRF name, its default route distinguisher (RD) of 65001:100, and the interfaces assigned to it. The interfaces listed are Gi0/0.100 and Gi0/1.100, which are both subinterfaces (indicated by the .100 suffix). Therefore, the VRF CUSTOMER is correctly configured with two subinterfaces.
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.
✓
The VRF CUSTOMER is configured with two subinterfaces.
Why this is correct
The output lists two interfaces under the VRF.
Related concept
Read the scenario before looking for a memorised answer.
✗
The VRF CUSTOMER has no route distinguisher configured.
Why it's wrong here
The RD is shown as 65001:100.
✗
The VRF CUSTOMER is not active because no routes are shown.
Why it's wrong here
The VRF is active, as indicated by the interfaces.
✗
The VRF CUSTOMER is using OSPF as the routing protocol.
Why it's wrong here
The output does not show routing protocol information.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between VRF configuration output and routing information; the trap here is that candidates may assume a VRF is inactive or misconfigured because no routes are shown, when in fact 'show ip vrf' only displays the VRF name, RD, and interface assignments.
Trap categories for this question
Command / output trap
The RD is shown as 65001:100.
Detailed technical explanation
How to think about this question
A VRF (Virtual Routing and Forwarding) instance creates a separate routing table on a router, allowing overlapping IP addresses across different customers. The route distinguisher (RD) is a 64-bit value (e.g., 65001:100) that makes customer routes globally unique when advertised via MP-BGP. Subinterfaces are commonly used with 802.1Q VLAN trunking to associate multiple logical links with a single physical interface, each belonging to a different VRF.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VRF CUSTOMER is configured with two subinterfaces. — The output of 'show ip vrf CUSTOMER' displays the VRF name, its default route distinguisher (RD) of 65001:100, and the interfaces assigned to it. The interfaces listed are Gi0/0.100 and Gi0/1.100, which are both subinterfaces (indicated by the .100 suffix). Therefore, the VRF CUSTOMER is correctly configured with two subinterfaces.
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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Question Discussion
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