Drag or tap steps into the slots.
Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
mediumDrag & Drop
300-410 Practice Question: Drag and drop the steps for MPLS LDP label…
Drag and drop the steps for MPLS LDP label discovery and distribution into the correct order, from first to last.
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
✓
Establish TCP connection on port 646
LDP label discovery and distribution begins with sending Hello messages to multicast 224.0.0.2 (UDP). Once a Hello is received, a LDP adjacency is formed directly, then a TCP connection on port 646 is established between the peers. After TCP is up, label mapping messages are exchanged. Finally, the learned labels populate the Label Information Base (LIB). The correct order is: B (Hello), C (adjacency), A (TCP connection), D (label mapping), E (LIB). Note that adjacency is formed before the TCP connection because LDP uses a two-phase discovery process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Establish TCP connection on port 646
Why this is correct
Establish TCP connection on port 646: This occurs after the LDP adjacency is formed, as part of session initialization.
- ✓
Send LDP Hello messages to multicast 224.0.0.2
Why this is correct
Send LDP Hello messages to multicast 224.0.0.2: This is the first step in LDP discovery to find potential neighbors.
- ✓
Form LDP adjacency with neighbor
Why this is correct
Form LDP adjacency with neighbor: This happens immediately after receiving a Hello, before the TCP connection is established.
- ✓
Exchange label mapping messages
Why this is correct
Exchange label mapping messages: This occurs after the TCP connection is established and the LDP session is initialized.
- ✓
Populate Label Information Base (LIB)
Why this is correct
Populate Label Information Base (LIB): This is the final step, after label mappings have been exchanged.
Visual reference
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
About these practice questions
One of 1,401 original 300-410 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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.