CISA Governance and Management of IT Practice Question
An IT manager is reviewing the service level agreements (SLAs) for a cloud-based email service. The SLA guarantees 99.9% uptime per month. The service experienced an outage of 45 minutes in a 30-day month. Did the service meet the SLA?
⚠ Common exam trap
The trap here is that candidates may incorrectly round 43.2 minutes to 43 minutes and then assume 45 minutes is close enough, or they may mistakenly think 0.1% of a month is 30 minutes, leading them to choose option C.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No, because the allowed downtime for 99.9% uptime is approximately 43 minutes.
The SLA guarantees 99.9% uptime per month. For a 30-day month (43,200 minutes), 99.9% uptime allows only 0.1% downtime, which is 43.2 minutes. The actual outage of 45 minutes exceeds this threshold, so the SLA was not met. Option D correctly identifies the allowed downtime as approximately 43 minutes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Yes, because 45 minutes is within 0.1% of the total time.
Why it's wrong here
0.1% of 30 days is 43.2 minutes, so 45 minutes exceeds the allowed downtime.
- ✗
Yes, because the SLA is calculated per day, not per month.
Why it's wrong here
SLAs are typically calculated over the billing period; per-day calculation would be even stricter.
- ✗
No, because any downtime exceeding 30 minutes is a violation.
Why it's wrong here
The SLA does not specify a 30-minute threshold; it is based on percentage.
- ✓
No, because the allowed downtime for 99.9% uptime is approximately 43 minutes.
Why this is correct
The SLA allows 43.2 minutes; 45 minutes is over the limit.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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