H19-410_V1.0 · Question #135
Which of the following are WDM protections? (Multiple Choice)
The correct answer is A. Client side 1+1 B. 1+1 within the board C. ODUkSNCP. A (Client side 1+1), B (1+1 within the board), and C (ODUkSNCP) are all valid WDM protection mechanisms because they operate at layers native to WDM/OTN systems. Client side 1+1 duplicates the client signal across two separate optical paths, ensuring continuity if one path…
Question
Which of the following are WDM protections? (Multiple Choice)
Options
- AClient side 1+1
- B1+1 within the board
- CODUkSNCP
- DMultiplex Segment Protection
How the community answered
(70 responses)- A71% (50)
- D29% (20)
Explanation
A (Client side 1+1), B (1+1 within the board), and C (ODUkSNCP) are all valid WDM protection mechanisms because they operate at layers native to WDM/OTN systems. Client side 1+1 duplicates the client signal across two separate optical paths, ensuring continuity if one path fails. 1+1 within the board provides hardware-level redundancy inside the WDM equipment itself. ODUkSNCP (Optical Data Unit Sub-Network Connection Protection) is an OTN-layer path protection scheme integrated into modern WDM platforms.
D (Multiplex Segment Protection) is the distractor - it belongs to SDH/SONET terminology (Multiplex Section Protection in SDH), not WDM. It protects SDH multiplex sections and operates at a completely different network layer and technology domain.
Memory tip: Think of WDM protection as covering three scopes - Client, Board, ODU (CBO). Anything referencing "Multiplex Segment/Section" is SDH - if you see that term on a WDM question, it's the trap answer.
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