350-501 MPLS and Segment Routing Practice Question
Exhibit
segment-routing traffic-engineering policy POLICY1 color 100 end-point 192.0.2.1 candidate-path path1 preference 50 explicit segment-list SEG1 ! segment-list SEG1 index 10 mpls label 16000 index 20 mpls label 16001 index 30 mpls label 16002 !
Refer to the exhibit. An operator configures an SR-TE policy on a headend router. Which statement is true about the traffic steered into this policy?
⚠ Common exam trap
Cisco often tests the distinction between explicit segment-lists (which require manual label configuration) and dynamic path computation (CSPF), leading candidates to mistakenly assume CSPF is always used in SR-TE policies.
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 headend will impose a label stack containing labels 16000, 16001, and 16002
The SR-TE policy uses a segment-list with three labels (16000, 16001, 16002), which are MPLS labels assigned to prefix-SIDs for specific nodes. The headend imposes this label stack to steer traffic along the explicit path defined by the segment-list, ensuring strict source routing without relying on dynamic CSPF computation or LDP.
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 segment-list consists of adjacency-SIDs
Why it's wrong here
Labels 16000,16001,16002 are typical prefix-SIDs.
- ✗
The path is automatically computed using CSPF based on IGP metrics
Why it's wrong here
The path is explicitly defined via segment-list.
- ✗
Traffic is forwarded using MPLS LDP labels
Why it's wrong here
SR-TE does not use LDP; it uses SR labels.
- ✓
The headend will impose a label stack containing labels 16000, 16001, and 16002
Why this is correct
Explicit segment-lists define the ordered list of labels.
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Written by Johnson Ajibi, MSc IT Security
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