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?
A. 2 hours B. 3 hours C. 28 hours D. 38 hours
B. 3 hours C. 28 hours D. 38 hours
C. 28 hours D. 38 hours
D. 38 hours
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MTBF: Average time available for a system or component to perform its normal operations between failures
MTBF= Total uptime / Number of failures
MTTR: Average time required to repair a failed component
MTTR = Total downtime / Number of failures
No need to consider the downtime for Saturday since the question mentioned about Monday to Friday. So MTTR will be 6h downtime/3 incidents = 2
MTTR = Total downtime / Number of failures
A. 2 hours
B. 3 hours
C. 28 hours
D. 38 hours
Correct answer: 2 hours