ITIL 4 Foundation Practice Exam

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What is the mean time between failures (MTBF) used to indicate?

The average time taken to restore services
The time taken for training cycles in IT services
How frequently a service fails
The total downtime of a service

The correct answer is: How frequently a service fails

Mean time between failures (MTBF) is a critical measurement used in IT service management to illustrate the reliability of a service or system. It specifically indicates how frequently a service experiences failures over a given period. The calculation of MTBF involves analyzing the operational time between incidents of failure, thereby providing insights into the expected performance and reliability of the service. By focusing on the frequency of failures, MTBF helps organizations assess the effectiveness of their systems and identify areas for improvement. A higher MTBF indicates that the service is functioning well with fewer failures, while a lower MTBF suggests that failures are occurring more frequently, signaling the need for investigation and perhaps enhanced monitoring or maintenance protocols. Understanding MTBF is essential for planning maintenance and for setting customer expectations, as it can guide decisions on resource allocation and improvement initiatives. This is why it is recognized specifically for tracking service failures, as emphasized in this context.