hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or Tunnel Id Switched interface 16 Pop Label 10.1.1.0/24 0 Gi0/0 192.168.1.2 17 21 10.2.2.0/24 1500 Gi0/0 192.168.1.2 18 Untagged 10.3.3.0/24 0 Gi0/1 192.168.2.2
Based on this output, what is the problem with the label entry for 10.3.3.0/24?
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
✓
The next-hop router 192.168.2.2 is not an LDP neighbor for this prefix.
The entry for 10.3.3.0/24 shows 'Untagged' in the outgoing label column, meaning the router is forwarding IP packets without an MPLS label. This indicates that the next-hop router (192.168.2.2) did not assign a label for this prefix, possibly because LDP is not enabled on that interface or the neighbor is not an LDP peer.
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 label 18 is being swapped correctly.
Why it's wrong here
The outgoing label is 'Untagged', not swapped.
- ✗
The prefix 10.3.3.0/24 is being forwarded with MPLS label 18.
Why it's wrong here
The outgoing label is 'Untagged', so no label is used.
- ✓
The next-hop router 192.168.2.2 is not an LDP neighbor for this prefix.
Why this is correct
'Untagged' indicates the next hop did not provide a label.
- ✗
The label 18 is being popped by the next-hop router.
Why it's wrong here
Pop Label is used for penultimate hop popping, not 'Untagged'.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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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