10 free CSSGB practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
CSSGB Practice Test 14Tutor mode
Question 1 of 10
Analyze Phase
A data-center team built the fault tree shown for a power loss during a utility outage. The basic events are independent: utility failure has a probability of 0.05 per year, and the UPS and the generator fail on demand with probabilities 0.20 and 0.30. What is the exact probability of the top event per year?
Fault tree: server room loses power
The top event requires utility power failure AND backup power failure; backup power fails if the UPS fails OR the generator fails to start.