easyMultiple Choice
350-401 Practice Question: Runs the following command on Router R4: R4# show…
A network engineer runs the following command on Router R4:
R4# show mpls interfaces Interface IP Tunnel BGP Static Operational
GigabitEthernet0/0 Yes No No No Yes GigabitEthernet0/1 Yes No No No Yes GigabitEthernet0/2 No No No No No
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the distinction between the 'IP' column (configuration) and the 'Operational' column (actual forwarding state), leading candidates to mistakenly assume an interface is operational just because MPLS is configured, or to misinterpret the 'No' in the IP column as meaning MPLS is disabled entirely rather than just not enabled for IP label distribution.
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
✓
MPLS is enabled and operational on GigabitEthernet0/0 and GigabitEthernet0/1.
The 'show mpls interfaces' command displays MPLS status per interface. The 'Operational' column indicates whether MPLS is actively forwarding labels. GigabitEthernet0/0 and GigabitEthernet0/1 both show 'Yes' in the Operational column, confirming MPLS is enabled and operational on those interfaces. GigabitEthernet0/2 shows 'No' in both the IP and Operational columns, meaning MPLS is not enabled or operational there.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
MPLS is enabled and operational on GigabitEthernet0/0 and GigabitEthernet0/1.
Why this is correct
The correct interpretation of the `show mpls interface` output is that both GigabitEthernet0/0 and GigabitEthernet0/1 have MPLS enabled and fully operational. The presence of 'IP: Yes' for each interface indicates that IPv4 label switching is active, while 'Operational: Yes' confirms that the MPLS data plane is ready to forward labeled packets. Therefore, MPLS is not only configured but also functioning on these two interfaces.
- ✗
MPLS is enabled on all three interfaces, but only Gi0/0 and Gi0/1 are operational.
Why it's wrong here
This choice incorrectly assumes that GigabitEthernet0/2 also has MPLS enabled, but the output shows 'IP: No' for that interface. The 'IP' column reflects whether MPLS is enabled for IPv4 on the interface; a 'No' means the interface has no MPLS configuration or no IPv4 address bound to an MPLS-capable VRF. Consequently, MPLS is not enabled on all three interfaces—only Gi0/0 and Gi0/1 meet the criteria for MPLS operation.
- ✗
BGP and Static label switching are enabled on Gi0/0 and Gi0/1.
Why it's wrong here
The BGP and Static columns in the output indicate whether Border Gateway Protocol or statically configured label bindings are being used for label distribution on the interface. Both fields show 'No' for GigabitEthernet0/0 and GigabitEthernet0/1, proving that neither BGP nor static label switching is active. This eliminates the possibility that MPLS forwarding on these interfaces relies on BGP or static labels, so the option is factually incorrect.
- ✗
Tunnel interfaces are configured on Gi0/0 and Gi0/1.
Why it's wrong here
The Tunnel column specifically reports whether MPLS is enabled on tunnel interfaces, not on physical GigabitEthernet interfaces. For both Gi0/0 and Gi0/1, this column displays 'No', indicating that no tunnel interfaces are involved in MPLS label switching. Thus, claiming that tunnel interfaces are configured on these two interfaces misreads the output and is incorrect.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.