The answer is C.
In an MPLS network, Service Provider Edge (PE) routers use Multiprotocol Border Gateway Protocol (MP-BGP) to exchange label and route information with each other. MP-BGP is the routing protocol used to create and distribute labels between service provider edge routers on an MPLS network.
The protocol that supports labeled paths between PE (Provider Edge) routers in an MPLS (Multiprotocol Label Switching) network is LDP (Label Distribution Protocol), although RSVP-TE (Resource Reservation Protocol - Traffic Engineering) is also commonly used for more advanced features.
A is the correct answer.
LDP is the primary protocol for establishing label-switched paths (LSPs) within an MPLS network.
MP-BGP is used to exchange VPN routes and label information between PE routers in an MPLS VPN environment, but is not directly involved in establishing labeled paths MP-BGP is primarily used to advertise customer prefixes and associated labels.
Guys why exactly you say C ? it's A , it says between PE routers . P routers play only with IGP and LDP . MP-BGP and actually MP-ibgp is used for different reason. Is used to distributing VPN routes , VPNv4 routes.
LDP is used to create the paths. RSVP is used for traffic engineering.
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