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Question 306 of 1,420
mediumDrag & DropObjective-mapped
350-401 Practice Question: Drag and drop the steps of LDP session…
Drag and drop the steps of LDP session establishment between LSRs into the correct order, from first to last.
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Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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LSRs send LDP Hello messages (UDP)
LDP session establishment starts with discovering neighbors via Hello messages over UDP, then opening a TCP connection. The LSRs exchange initialization parameters over TCP, followed by Keepalive messages to confirm the session. Finally, label mappings are exchanged for FECs.
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Same concept, more angles
1 more way this is tested on 350-401
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Variation 1. Drag and drop the steps of LDP session establishment between LSRs into the correct order, from first to last.
medium- ✓ A.LSRs send LDP Hello messages via UDP (224.0.0.2)
- ✓ B.TCP connection established between LSRs (port 646)
- ✓ C.LDP Initialization message with parameters exchanged
- ✓ D.KeepAlive messages and Label Mapping messages sent
- ✓ E.LDP session transitions to OPERATIONAL state
Why A: LDP session establishment starts with Hello discovery via UDP, then TCP connection setup, LDP initialization with parameters, label exchange via KeepAlive and Label Mapping, and finally session up with full label exchange.
Last reviewed: Jun 18, 2026
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