350-501 Architecture Practice Question
A large SP network uses Segment Routing (SR) with MPLS data plane. They want to enforce a strict path for certain traffic flows across the core while using shortest-path for others. Which technique should be used?
⚠ Common exam trap
Cisco often tests the distinction between SR-TE explicit paths (which enforce strict hop-by-hop routing) and SR policies using color communities (which are more about traffic steering based on BGP attributes, not strict path enforcement).
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
✓
SR-TE with explicit path using segment list
SR-TE with an explicit path using a segment list allows the operator to define a strict, ordered list of MPLS labels (segments) that the traffic must follow, overriding the default IGP shortest-path behavior. This is the correct technique for enforcing a strict path across the core while leaving other traffic to use shortest-path forwarding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SR-TE with explicit path using segment list
Why this is correct
SR-TE with a segment list defines the exact path through the network.
- ✗
Using TI-LFA
Why it's wrong here
TI-LFA provides fast reroute, not strict path enforcement.
- ✗
Configuring bandwidth reservation on all links
Why it's wrong here
Bandwidth reservation is not a strict path mechanism and is not SR-specific.
- ✗
Using SR policies with color extended community based on BGP
Why it's wrong here
Color-based steering uses BGP to map traffic to SR policies, but the underlying path may still be shortest-path unless the policy explicitly defines a segment list.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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