ISC2 CC Practice Question: Business Continuity, Disaster Recovery, and Incident Response
An organization's business continuity plan designates a maximum tolerable downtime (MTD) of 8 hours for its order processing system. The system's recovery time objective (RTO) is set at 4 hours, and work recovery time (WRT) is estimated at 2 hours. If a disaster occurs at 10:00 AM and the system is restored at 2:00 PM, but additional configuration and data validation take until 3:30 PM to complete, what is the total downtime and is the MTD met?
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
✓
5.5 hours, MTD met
Total downtime is from 10:00 AM to 3:30 PM = 5.5 hours. MTD is 8 hours, so 5.5 hours is within MTD. However, note that RTO (4 hours) was exceeded because system restoration at 2:00 PM is 4 hours after 10:00 AM (exactly 4 hours? Actually 10 AM to 2 PM is 4 hours, so RTO exactly met. WRT is separate. MTD is met.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
4 hours, MTD exceeded
Why it's wrong here
Both figures are incorrect.
- ✓
5.5 hours, MTD met
Why this is correct
Total downtime includes recovery and work recovery time: 5.5 hours, which is less than MTD of 8 hours.
- ✗
4 hours, MTD met
Why it's wrong here
Downtime is 5.5 hours, not 4 hours, because full functionality wasn't restored until 3:30 PM.
- ✗
5.5 hours, MTD exceeded
Why it's wrong here
MTD is 8 hours, so 5.5 hours does not exceed it.
Go deeper
Related to this question
Learn chapter
Business Continuity and Disaster Recovery
Key term
Recovery
Recovery is the process of restoring systems, data, and operations after a security incident, failure, or disaster to return to normal functioning.
Key term
RTO
Recovery Time Objective is the maximum acceptable time to restore a system or data after a disaster, defining how quickly normal operations must resume.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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