Segment Routing Prefix Segments
Question
Which statement about segment routing prefix segments is true?
Answers
Explanations
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A. B. C. D.C.
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-Segment Routing (SR) is a source routing paradigm that provides a flexible way of forwarding packets across a network. In SR, a source node steers a packet through a specific path by encoding the path information in the packet header. The path information is represented by a sequence of segments, where each segment identifies a specific network resource, such as a node or a link.
A prefix segment is a type of segment that identifies a prefix in the network. A prefix is a block of IP addresses that share the same network prefix. For example, the prefix 192.0.2.0/24 includes all IP addresses from 192.0.2.0 to 192.0.2.255. A prefix segment is represented by a segment identifier (SID) that is associated with a specific prefix.
Answer (C) is correct: A segment routing prefix segment is linked to a prefix SID that is globally unique within the segment routing domain. The prefix SID is used to represent the prefix in the packet header, and it is used by the source node to steer the packet through the network. The prefix SID is distributed using routing protocols or other mechanisms, such as BGP or ISIS.
Answer (A) is incorrect: A segment routing prefix segment is not necessarily the longest path to a node. The path can be selected based on various factors, such as link bandwidth, delay, or availability.
Answer (B) is incorrect: A segment routing adjacency SID is a type of SID that is used to identify an adjacency, which is a link between two nodes. The adjacency SID is globally unique within the router, but it is not associated with a prefix.
Answer (D) is incorrect: Segment routing can be used with various routing protocols, such as OSPF or ISIS, and it does not require the use of EIGRP.
