D-ISM-FN-01 · Question #553
An Ethernet switch has eight ports and all ports must be operational for 24 hours from Monday through Friday. However, a failure of Port 7 occurs as follows: Monday=4 PM to 11 PM Wednesday= 2 PM to…
The correct answer is C. 7 hours. To calculate MTTR, we need to convert the hours into minutes. Here are the steps: Monday: Port 7 was down from 4 PM to 11 PM. That's 7 hours or 420 minutes. Wednesday: Port 7 was down from 2 PM to 10 PM. That's 8 hours or 480 minutes. Friday: Port 7 was down from 5 AM to11 AM…
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 7 occurs as follows:
Monday=4 PM to 11 PM Wednesday= 2 PM to 10 PM Friday= 5 AM to11 AM What is the MTTR of Port 7?
Options
- A36 hours
- B5 hours
- C7 hours
- D33 hours
How the community answered
(35 responses)- A3% (1)
- B11% (4)
- C77% (27)
- D9% (3)
Explanation
To calculate MTTR, we need to convert the hours into minutes. Here are the steps: Monday: Port 7 was down from 4 PM to 11 PM. That's 7 hours or 420 minutes. Wednesday: Port 7 was down from 2 PM to 10 PM. That's 8 hours or 480 minutes. Friday: Port 7 was down from 5 AM to11 AM. That's 6 hours or 360 minutes. Total corrective maintenance time = 420 + 480 + 360 = 1260 minutes Number of repairs = 3 MTTR = Total corrective maintenance time / Number of repairs MTTR = 1260 / 3 = 420 minutes Therefore, the MTTR of Port 7 is 420 minutes.
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