Match each Segment Routing component to its function.
Drag a concept onto its matching description — or click a concept then click the description.
Segment Identifier, an instruction in the SR header
Segment Routing Global Block of label values
Segment Routing over MPLS data plane
Topology-Independent Loop-Free Alternate for fast reroute
Path Computation Element Protocol for SR path computation
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SID: A unique identifier for a segment in a segment routing network.
In Segment Routing, SID uniquely identifies a segment, SRGB reserves a label range for global SIDs, and Prefix-SID is a global SID for an IGP prefix. Common confusions include mixing SID with SRGB and Prefix-SID with Adjacency-SID.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
SID: A unique identifier for a segment in a segment routing network.
Why this is correct
A Segment Identifier (SID) uniquely identifies a segment, which can be an instruction or a path.
SRGB: A reserved range of MPLS labels or SRv6 SIDs used for global segments.
Why this is correct
The Segment Routing Global Block (SRGB) is a reserved label range for global SIDs, ensuring uniqueness.
Prefix-SID: A global SID assigned to an IGP prefix.
Why this is correct
A Prefix-SID is a global SID associated with an IGP prefix, enabling shortest-path forwarding.
SID: A range of MPLS labels reserved for global segments.
Why it's wrong here
Incorrect — this describes the SRGB, not the SID. A SID is a specific identifier, not a range.
Prefix-SID: A local SID assigned to a specific adjacency.
Why it's wrong here
Incorrect — this describes an Adjacency-SID, which is local, whereas a Prefix-SID is global.
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