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300-410 Practice Question: The default behavior of LDP when establishing a…

What is the default behavior of LDP when establishing a session between two directly connected routers?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

LDP uses TCP port 646 for session establishment and UDP port 646 for hellos.

LDP uses hello messages to discover neighbors. By default, LDP hellos are sent to the multicast address 224.0.0.2 (all routers) on the local link. The session is established using the transport address, which by default is the router ID (usually the highest loopback or interface IP).

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    LDP sends hellos to the unicast address of each neighbor.

    Why it's wrong here

    LDP hellos are multicast by default, not unicast.

  • ✓

    LDP uses TCP port 646 for session establishment and UDP port 646 for hellos.

    Why this is correct

    LDP uses UDP port 646 for hello messages (discovery) and TCP port 646 for session establishment and label exchange.

  • ✗

    LDP hellos are sent to the all-OSPF-routers multicast address 224.0.0.5.

    Why it's wrong here

    LDP uses its own multicast address 224.0.0.2, not OSPF's.

  • ✗

    LDP sessions are established using UDP for reliability.

    Why it's wrong here

    LDP sessions use TCP for reliable transport; UDP is only for hellos.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.