Ref: How MPLS Traffic Engineering works - Cisco Community
“…
These components work together to make MPLS TE work:
…
• Path setup is a signaling protocol to reserve the resources for a traffic flow and to establish the LSP for a traffic flow. Resource Reservation Protocol (RSVP) is used for this purpose and has been enhanced with TE extensions for carrying labels and building the LSP. An alternative to RSVP for MPLS TE is constrained routing with Label Distribution Protocol (LDP), but Cisco devices do not support this protocol.
…”
A. TDP
Wrong answer.
B. RSVP
Correct answer.
C. LDP
Wrong answer.
D. BGP
Wrong answer.
B is correct.
MPLS traffic engineering automatically establishes and maintains LSPs across the backbone by using RSVP.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-11/mp-te-path-setup-xe-16-11-book/mpls-traffic-engineering-and-enhancements.html
upvoted 2 times
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C (25%)
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