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Exam NCP-AII Topic 1 Question 9 Discussion

Actual exam question for NVIDIA's NCP-AII exam
Question #: 9
Topic #: 1
A DGX H100 system shows intermittent "Link Down" errors on a 200G DAC cable. CVT reports "No Signal" despite physical connection. What is the first hardware check?

Suggested Answer: D Vote an answer

The first hardware check should be cable compatibility and connector inspection. A "No Signal" result from the Cable Validation Tool indicates that the physical layer is not establishing a usable signal, even though the cable appears to be inserted. In DGX H100 and NVIDIA high-speed networking environments, DAC cables must be validated for the correct speed, adapter generation, switch platform, firmware compatibility, and physical form factor. A damaged connector, unsupported cable, poorly seated latch, excessive bend radius, or wrong cable type can cause intermittent "Link Down" events. Replacing an optical transceiver is not appropriate because the issue is on a DAC connection, not an optical link. Reconfiguring the port to 100G may mask the failure but does not validate the required 200G operation. Upgrading all switches for RS-FEC is too broad and does not address a local "No Signal" condition. Proper physical-layer bring-up requires confirming the cable is supported, visually inspecting both ends, reseating it, and checking whether the link comes up cleanly before moving to firmware or switch-level troubleshooting.

by Lou at May 21, 2026, 11:45 AM

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