An Ethernet switch has eight ports and all ports must be operational for 24 hours, from Monday through Friday. However, a failure of Port4 occurs as follows:
· Monday = 8 PM to 9 PM
· Wednesday 7 PM to 9 PM
· Thursday = 6 AM to 9 AM
· Saturday = 4 PM to 7 PM
What is the MTTR of Port 4?
- 2 hours
- 3 hours
- 28 hours
- 38 hours
Answer(s): A
Explanation:
MTTR = Total downtime / Number of failures
MTTR = 1+2+3 / 3 = 2