mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router PE1: PE1#…
A network engineer runs the following command on Router PE1:
PE1# show mpls forwarding-table 192.168.1.0 24
Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or Tunnel Id Switched interface 16 Pop Label 192.168.1.0/24 0 Gi0/0 10.1.1.2 17 22 192.168.1.0/24 0 Gi0/1 10.2.2.2
Based on this output, which statement is correct?
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 router is performing load balancing across two LSPs for prefix 192.168.1.0/24.
The show mpls forwarding-table output shows two entries for the same prefix. The first entry has 'Pop Label' as outgoing label, meaning PHP (Penultimate Hop Popping) is in use for that path. The second entry has label 22, indicating a different LSP. The presence of two entries for the same prefix suggests load balancing across two equal-cost paths.
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 router is performing load balancing across two LSPs for prefix 192.168.1.0/24.
Why this is correct
Two forwarding entries for the same prefix with different outgoing interfaces and labels indicate ECMP load balancing.
- ✗
The router has a routing loop for prefix 192.168.1.0/24.
Why it's wrong here
No evidence of loop; both paths are valid.
- ✗
Penultimate Hop Popping is disabled on this router.
Why it's wrong here
The first entry shows 'Pop Label', which indicates PHP is enabled.
- ✗
The prefix 192.168.1.0/24 is learned via BGP from two different neighbors.
Why it's wrong here
The output does not show the routing protocol; it only shows MPLS forwarding entries.
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
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