Which feature provides service independence in service provider networks?

Question

Options

• Anode SID that identifies the network device
• Bprefix SID that contains router hops toward the destination
• Cadjacency SID that represents a path between the routers
• Dbinding SID that is used to stitch different domains

• A
  86% (31)
• B
  8% (3)
• C
  3% (1)
• D
  3% (1)

Explanation

In Segment Routing (SR), service independence means that services (such as VPNs or traffic engineering) are decoupled from the underlying transport infrastructure. A Node SID uniquely identifies a specific network device (router) and instructs the network to forward packets along the ECMP-aware shortest path to that node without embedding any service-specific state in the network core. This makes services independent of the physical path taken - the service is attached to the node, not to a particular link or path. A Prefix SID (Option B) identifies a destination prefix and encodes hop information but is path-oriented. An Adjacency SID (Option C) encodes a specific link and is highly path-dependent. A Binding SID (Option D) is used to stitch SR policies across domains (inter-domain stitching) and is not the primary mechanism for service independence within a domain. The Node SID's ability to abstract the destination node from the transport path is what provides service independence.

No community discussion yet for this question.