hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router PE6: PE6#…
A network engineer runs the following command on Router PE6:
PE6# show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or Tunnel Id Switched interface 16 Pop Label 10.0.0.1/32 0 Gi0/0 10.1.1.1 17 20 10.0.0.2/32 0 Gi0/1 10.2.2.2 18 Untagged 10.0.0.3/32 0 Gi0/2 10.3.3.3
Based on this output, what is the problem?
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 not enabled on interface Gi0/2.
The MPLS forwarding table shows three entries. The third entry for prefix 10.0.0.3/32 has 'Untagged' as the outgoing label. This means the outgoing interface for that prefix does not have MPLS enabled, or the next hop does not support MPLS. This is a problem because MPLS packets cannot be forwarded with an untagged label.
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 not enabled on interface Gi0/2.
Why this is correct
The 'Untagged' label indicates MPLS is not enabled on the outgoing interface or the next hop is not an MPLS router.
- ✗
The router has run out of local labels.
Why it's wrong here
Local labels 16, 17, 18 are assigned, so labels are available.
- ✗
Penultimate Hop Popping is misconfigured.
Why it's wrong here
PHP is correctly shown for the first entry; the issue is specific to the third entry.
- ✗
The prefix 10.0.0.3/32 is not reachable.
Why it's wrong here
The entry exists, so the prefix is reachable; the problem is with MPLS encapsulation.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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