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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The given answer is correct. RSVP is the protocol used to do traffic engineering in an MPLS network.
Answer B its correct
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