Dell-EMC
DEA-1TT5 · Question #225
An Ethernet switch has eight ports and all ports must be operational for 24 hours; from Monday through Friday. However, a failure of Port 5 occurs as follows: - Tuesday = 6 AM to 7 AM - Thursday = 5…
The correct answer is D. 38 hours. Mean Time Between Failures (MTBF): Total uptime (ProdTime - DownTime) / Number of failures (120-6) / 3 114 / 3 = 38h
Modern Data Center Infrastructure
Question
An Ethernet switch has eight ports and all ports must be operational for 24 hours; from Monday through Friday. However, a failure of Port 5 occurs as follows:
- Tuesday = 6 AM to 7 AM
- Thursday = 5 PM to 9 PM
- Friday = 8 AM to 9 AM
What is the MTBF of Port 5?
Options
- A30 hours
- B32 hours
- C40 hours
- D38 hours
How the community answered
(44 responses)- A9% (4)
- B2% (1)
- C5% (2)
- D84% (37)
Explanation
Mean Time Between Failures (MTBF): Total uptime (ProdTime - DownTime) / Number of failures (120-6) / 3 114 / 3 = 38h
Topics
#MTBF#Ethernet switch#port failure#availability metrics
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