350-401 Question #525: Real Exam Question with Answer & Explanation

Question

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?

Options

• AConfigure the interface bandwidth to handle TCP and UDP traffic between the LDP peers
• BConfigure a Cisco MPLS TE tunnel on both ends of the session
• CConfigure an access list on the interface to permit TCP and UDP traffic
• DConfigure a targeted neighbor session.

Explanation

To enable extended discovery for an MPLS LDP session between non-directly connected headend and tailend routers of an MPLS TE tunnel, a targeted neighbor session must be configured.

Common mistakes.

• A. Configuring interface bandwidth is related to QoS and traffic engineering, but it does not directly facilitate or configure the LDP session discovery process itself.
• B. Configuring the MPLS TE tunnel on both ends is a prerequisite for the tunnel functionality, but it is a separate configuration from enabling extended LDP session discovery between the tunnel's endpoints.
• C. Configuring an access list is a security measure to permit or deny traffic, including LDP (TCP port 646) traffic, but it is not the mechanism for initiating or enabling LDP's extended discovery process.

Concept tested. MPLS LDP Targeted Neighbor (TLDP)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/configuration/15-mt/mp-15-mt-book/mp-ldp-ovrw.html

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