350-501 MPLS and Segment Routing Practice Question
In SR-MPLS, what is the purpose of the SRGB (Segment Routing Global Block)?
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 global label space for prefix SIDs
SRGB is a reserved label range used for globally significant prefix SIDs. All routers in the domain use the same SRGB to ensure consistent label mapping.
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 define the range of labels used for LDP
Why it's wrong here
LDP uses its own label space.
- ✓
To provide a global label space for prefix SIDs
Why this is correct
Correct: SRGB is for prefix SIDs.
- ✗
To reserve labels for MPLS-TE tunnels
Why it's wrong here
TE tunnels use dynamic labels or RSVP.
- ✗
To allocate labels for adjacency SIDs
Why it's wrong here
Adjacency SIDs are local, not from SRGB.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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