350-501 Networking Practice Question
Which TWO tasks are required when implementing segment routing in an MPLS network?
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 the IGP (OSPF or IS-IS) with segment routing extensions
Options C and D are correct. Configuring the IGP (OSPF or IS-IS) with segment routing extensions is essential to advertise prefix-SIDs and adjacency-SIDs, enabling segment routing control plane. Enabling MPLS on all interfaces that participate in segment routing forwarding is required to enable MPLS forwarding for the SIDs. Option A (RSVP-TE) is not required because segment routing uses source-routed paths instead of RSVP-TE LSPs. Option B (CEF) is generally enabled by default on Cisco routers and is a prerequisite for MPLS forwarding, but it is not a task specific to implementing segment routing. Option E (LDP) is not required because segment routing replaces LDP with SID-based label distribution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure RSVP-TE to establish LSPs
Why it's wrong here
RSVP-TE is a separate traffic engineering protocol, not required for segment routing.
- ✗
Enable CEF on all routers
Why it's wrong here
CEF is required for MPLS but is a generic prerequisite, not a task specific to segment routing implementation.
- ✓
Configure the IGP (OSPF or IS-IS) with segment routing extensions
Why this is correct
IGP must be configured to support segment routing and advertise labels (prefix-SIDs).
- ✓
Enable MPLS on all interfaces that participate in segment routing forwarding
Why this is correct
MPLS must be enabled globally and on interfaces to forward traffic based on labels.
- ✗
Enable LDP on all routers and interfaces
Why it's wrong here
LDP is not needed because segment routing uses IGP to distribute labels.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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