350-501 MPLS and Segment Routing Practice Question
What is the primary purpose of the SRGB (Segment Routing Global Block) when configuring SR-MPLS on a 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
✓
To provide a common label space for global segments, ensuring consistent label to prefix mapping.
SRGB defines a range of labels reserved for global segments (e.g., Node SIDs). It ensures that a given Node SID maps to the same label across all routers in the SR domain, simplifying operations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
To provide a common label space for global segments, ensuring consistent label to prefix mapping.
Why this is correct
Correct.
- ✗
To set aside labels for MPLS-TE tunnels.
Why it's wrong here
TE tunnels use dynamic labels.
- ✗
To allocate labels for adjacency SIDs only.
Why it's wrong here
Adjacency SIDs are local and not from SRGB.
- ✗
To define the range for LDP labels used in SR interworking.
Why it's wrong here
SRGB is for SR labels.
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