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The Ethernet switch has eight ports and all ports must be operational for 24 hours, from Monday through Friday. However, a failure of Port 4 occurs as follows: Monday = 8 PM to 11 PM - Wednesday = 7 PM to 10 PM - Thursday = 6 AM to 12 PM - What is the MTTR of Port 4?
Correct Answer: D
The Mean Time to Repair (MTTR) is calculated by averaging the repair times of the failed component. For Port 4, the failures and repair durations are as follows: * Monday: 8 PM to 11 PM (3 hours) * Wednesday: 7 PM to 10 PM (3 hours) * Thursday: 6 AM to 12 PM (6 hours) Total downtime = 3 + 3 + 6 = 12 hours Number of failures = 3 MTTR = Total downtime / Number of failures = 12 hours / 3 = 4 hours References: Dell Information Storage and Management V5 Course Materials, Reliability, Availability, and Serviceability (RAS) Section.