Which statement about segment routing prefix segments is true?

The correct answer is A. It is linked to a prefix SID that is globally unique within segment routing domain. In Segment Routing, a prefix segment represents a node or prefix in the network and is identified by a Prefix SID (Segment ID). The Prefix SID is globally significant and unique within the entire SR domain (SRGB - Segment Routing Global Block), meaning every router in the…

MPLS and Segment Routing

Question

Options

AIt is linked to a prefix SID that is globally unique within segment routing domain
BIt is the longest path to a node
CIt is linked to an adjacency SID that is globally unique within the router
DIt requires using EIGRP to operate

How the community answered

(41 responses)

A
93% (38)
C
5% (2)
D
2% (1)

Explanation

In Segment Routing, a prefix segment represents a node or prefix in the network and is identified by a Prefix SID (Segment ID). The Prefix SID is globally significant and unique within the entire SR domain (SRGB - Segment Routing Global Block), meaning every router in the domain understands it and can forward traffic based on it. It instructs packets to follow the shortest IGP path to that prefix. It is NOT linked to an adjacency SID (which is locally significant per router), does NOT represent the longest path, and does not require EIGRP (SR works with OSPF, IS-IS, or BGP).

Topics

#Segment Routing#Prefix SID#SID Concepts

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