350-501 · Question #252
What is a characteristic of prefix segment identifier?
The correct answer is C. It is globally unique. A prefix segment identifier (Prefix SID) in Segment Routing identifies an IP prefix and is designed to be globally unique within a Segment Routing domain. This global uniqueness ensures consistent forwarding behavior across the network.
Question
What is a characteristic of prefix segment identifier?
Options
- AIt contains a router to a neighbor
- BIt contains the interface address of the device per each link
- CIt is globally unique.
- DIt is locally unique.
How the community answered
(50 responses)- A4% (2)
- B6% (3)
- C88% (44)
- D2% (1)
Why each option
A prefix segment identifier (Prefix SID) in Segment Routing identifies an IP prefix and is designed to be globally unique within a Segment Routing domain. This global uniqueness ensures consistent forwarding behavior across the network.
A Prefix SID does not contain a router to a neighbor; rather, it identifies a destination prefix within the network.
A Prefix SID does not contain the interface address of a device; that is typically handled by adjacency SIDs or IP addressing itself.
A prefix segment identifier (Prefix SID) is a globally unique label in a Segment Routing domain. It identifies an IP prefix that is advertised by a router, allowing any router in the domain to forward traffic towards that prefix using the associated SID. This global uniqueness is fundamental to Segment Routing's ability to orchestrate paths without per-node state.
A Prefix SID is not locally unique; its strength lies in being globally unique within the Segment Routing domain for consistent path computation.
Concept tested: Segment Routing Prefix SID characteristics
Source: https://www.cisco.com/c/en/us/td/docs/iosxr/cisco_iosxr_software/segment_routing/segment_routing_sr/config_guide/b-segment-routing-sr-cg-iosxr-73x/b-segment-routing-sr-cg-iosxr-73x_chapter_01.html
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