CompTIA CASP+ Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Enhance your CompTIA CASP+ exam readiness with our comprehensive quizzes. Sharpen your skills with detailed flashcards and multiple choice questions, each with hints and in-depth explanations. Prepare effectively for this challenging exam!

Practice this question and more.

Given a firewall with an MTBF of 10,000 hours and an MTTR of 2 hours, what is the expected availability percentage?

99.98%
99.90%
99.95%
99.85%

The correct answer is: 99.98%

To determine the expected availability percentage of a system, the formula to use is: \[ \text{Availability} = \frac{\text{MTBF}}{\text{MTBF} + \text{MTTR}} \] Where MTBF (Mean Time Between Failures) indicates the average operational time before a failure occurs, and MTTR (Mean Time To Repair) indicates the average time taken to repair the system after a failure. In this case, the MTBF is 10,000 hours and the MTTR is 2 hours. By plugging these values into the formula: \[ \text{Availability} = \frac{10000}{10000 + 2} \] \[ \text{Availability} = \frac{10000}{10002} \] \[ \text{Availability} \approx 0.999800 \] To convert this decimal to a percentage, multiply by 100: \[ \text{Availability} \approx 99.98\% \] This indicates that the firewall is available and operational 99.98% of the time, which confirms the choice as the correct answer. This high level of availability reflects well on the reliability of the firewall, characterized by a long MTBF and relatively