350-501 MPLS and Segment Routing Practice Question
An SP network engineer is designing a new segment routing traffic engineering deployment within a single IGP area. The network consists of 50 core routers running IS-IS and MPLS. The engineer needs to steer traffic from Router A to Router D over a path that avoids high latency links. Which technology should be used to define and instantiate the explicit path?
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
✓
Configure an SR-TE policy with an explicit path using segment lists.
SR-TE policies with explicit paths using segment lists allow steering traffic over a specific sequence of nodes or links, avoiding high latency links. Option A is wrong because LDP distributes labels for IGP shortest path forwarding, not explicit path control. Option B is wrong because while PCE can assist with path computation, the question asks for the technology to define and instantiate the explicit path, which is the SR-TE policy itself. Option C is wrong because BGP-LU distributes labels for BGP prefixes, not for traffic engineering 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.
- ✗
Use LDP to distribute labels and rely on IGP shortest path.
Why it's wrong here
LDP follows IGP shortest path and cannot enforce an explicit path.
- ✗
Set up a Path Computation Element (PCE) and delegate path computation.
Why it's wrong here
PCE is an option but not the simplest; explicit paths can be configured directly without PCE.
- ✗
Implement BGP LU to create an explicit path via local policies.
Why it's wrong here
BGP-LU is for label distribution across domains, not for steering traffic within a domain.
- ✓
Configure an SR-TE policy with an explicit path using segment lists.
Why this is correct
SR-TE policies provide explicit path steering via segment lists specifying nodes or adjacency SIDs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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