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An engineer is implementing a Cisco MPLS TE tunnel to improve the streaming experience for the clients of a video-on-demand server. Which action must the engineer perform to configure extended discovery to support the MPLS LDP session between the headend and tailend routers?
Correct Answer: D
To support the MPLS LDP (Label Distribution Protocol) session between the headend and tailend routers for a Cisco MPLS TE (Traffic Engineering) tunnel, extended discovery must be configured. This is achieved by configuring a targeted neighbor session. Targeted LDP sessions are used to establish LDP adjacencies between non-directly connected LSRs (Label Switch Routers), which is necessary for setting up MPLS TE tunnels that span multiple hops. References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) v1.01.