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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?
Correct Answer: C
* Total Operational Hours (Monday to Friday): 24 hours/day * 5 days = 120 hours * Failure Times: * Tuesday: 1 hour (6 AM to 7 AM) * Thursday: 4 hours (5 PM to 9 PM) * Friday: 1 hour (8 AM to 9 AM) * Total Failure Hours: 1 + 4 + 1 = 6 hours * Mean Time Between Failures (MTBF) :MTBF=Total Operational HoursNumber of Failures=1203=40 hoursMTBF=Number of FailuresTotal Ope References: Dell ISM V5 Course, Module on Availability and Performance Management.