Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 456

A newly installed router starts establishing an LDP session from another MPLS router to which it is not directly connected. Which LDP message type responds by target router to the initiating router using UDP protocol?

Answer options

• A. notification message
• B. session message
• C. advertisement message
• D. extended discovery message

Correct answer: D

Explanation

The correct answer is D, as the extended discovery message is specifically used for LDP discovery between routers that are not directly attached. The other options, such as notification, session, and advertisement messages, serve different purposes in the LDP protocol and are not used for responding to discovery requests.