The question here is about segment routing it's not about what is used to build MPLS.
We all know that in normal MPLS network, you will have a combination of LDP to create the label bindings, you will also have IGP as underlay (OSPF, IS-IS) to route your internal traffic and BGP as overlay that will describe your customer information. Basically you have three protocols to build your MPLS network IGP, LDP, BGP.
Now segment routing allows us to simply this by getting rid of the unnecessary protocols like LDP, RSVP etc. and use our IGPs (OSPF, IS-IS) to distribute labels bindings. This is to reduce loads on the control plane.
I'm 100% sure the CORRECT ANSWER IS: CD
segment routing isn’t a protocol in the same way that RSVP or LDP are protocols. There is no “segment routing protocol” that two routers talk to each other to exchange MPLS labels.
Instead, the labels are advertised directly inside IS-IS or OSPF!
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