D-ISM-FN-01: Information Storage and Management Foundations

By Dell · Question Mode

QuestionQ1

Security and Management

An Ethernet switch has eight ports, and every port must operate for 24 hours per day from Monday through Friday. However, Port 6 experiences the following failures during the week:

  • Tuesday: 6 AM to 8 AM
  • Thursday: 5 PM to 10 PM
  • Friday: 7 AM to 9 AM

What is the MTBF for Port 6?

Explanation

MTBF is calculated as total operating time divided by the number of failures. Over 120 scheduled hours, Port 6 has 9 hours of downtime, leaving 111 operating hours. Dividing 111 hours by 3 failures gives an MTBF of 37 hours.

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