Dell Technologies Proven Professional – Information Storage and Management — Question 1

An Ethernet switch has eight ports and all ports must be operational for 24 hours from Monday through Friday. However, failures of Port 6 occur within the week as follows:

Tuesday = 6 AM to 8 AM -

Thursday = 5 PM to 10 PM -

Friday = 7 AM to 9 AM -
What is the MTBF of Port 6?

Answer options

Correct answer: D

Explanation

The MTBF is calculated by subtracting the total downtime from the total operational time. In this case, Port 6 was down for a total of 5 hours (2 hours on Tuesday, 5 hours on Thursday, and 2 hours on Friday), resulting in an MTBF of 40 hours. The other options are incorrect as they do not accurately reflect the calculation of downtime subtracted from the total operational time of 120 hours (24 hours x 5 days).