Dell-EMC
D-ISM-FN-23 · 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
Storage System Environment
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
(54 responses)- A6% (3)
- B11% (6)
- C4% (2)
- D80% (43)
Explanation
Mean Time Between Failures (MTBF): Total uptime (ProdTime - DownTime) / Number of failures (120-6) / 3 114 / 3 = 38h
Topics
#MTBF#Ethernet switch#reliability metrics#availability calculation
Community Discussion
No community discussion yet for this question.