SK0-004 · Question #674
A server with redundant power supplies connected to two different UPS units fails to gracefully shut down during a power outage. A technician has verified cables and both UPS units are properly…
The correct answer is A. Load tester. A load tester verifies whether a UPS can actually deliver its rated power output under real operating conditions, which is the appropriate tool when physical connections are confirmed good but shutdown behavior is still failing.
Question
A server with redundant power supplies connected to two different UPS units fails to gracefully shut down during a power outage. A technician has verified cables and both UPS units are properly connected. Which of the following hardware tools should the technician use to further troubleshoot this issue?
Options
- ALoad tester
- BOTDR
- CLoopback plug
- DCrimper
How the community answered
(45 responses)- A73% (33)
- B4% (2)
- C7% (3)
- D16% (7)
Why each option
A load tester verifies whether a UPS can actually deliver its rated power output under real operating conditions, which is the appropriate tool when physical connections are confirmed good but shutdown behavior is still failing.
A load tester applies a controlled electrical load to the UPS to simulate real server power draw and verify that the unit can sustain output, trigger graceful shutdown signaling, and respond correctly under stress. Even with cables verified and the unit appearing connected, a UPS with degraded batteries, insufficient capacity, or a failing inverter may not perform correctly under actual load - a condition only revealed through active load testing. This is the logical next hardware diagnostic step after physical inspection.
An OTDR (Optical Time Domain Reflectometer) is a fiber optic cable testing instrument used to locate breaks or measure signal loss in fiber runs, and has no relevance to power supply or UPS troubleshooting.
A loopback plug is used to test network interface cards and ports by redirecting outbound signals back into the same interface, and is unrelated to power or UPS diagnostics.
A crimper is a hand tool used to terminate network cables with RJ-45 connectors and has no application in power redundancy or UPS troubleshooting.
Concept tested: UPS load testing for power redundancy fault isolation
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