The correct answer is that data loss of up to 3 hours occurred. This is because the Recovery Point Objective (RPO) defines the maximum acceptable data loss in time, set here at 1 hour, meaning backups or replication should capture all data within that window. When the failover process took 4 hours, any data written during the 3-hour gap between the RPO boundary and the actual failure was not yet replicated, resulting in a data loss window that directly exceeds the RPO. On the ISC2 Certified in Cybersecurity CC exam, this scenario tests your understanding of how RPO calculation works in real-world disaster recovery, often appearing as a trap where candidates confuse RPO with Recovery Time Objective (RTO). A common memory tip is to think of RPO as the "point of no return" for data—if the failover time exceeds it, you lose the difference. Remember: RPO is about data, RTO is about downtime.
ISC2 CC Business Continuity, DR & Incident Response Practice Question
This CC practice question tests your understanding of business continuity, dr & incident response. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company's primary data center experiences a complete power failure, and operations are shifted to a secondary site. The failover process takes 4 hours, but the recovery point objective (RPO) is set to 1 hour. Which of the following is the most likely consequence of this incident?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Data loss of up to 3 hours occurred.
The RPO of 1 hour means the company can tolerate losing up to 1 hour of data. Since the failover took 4 hours, any data written in the 3 hours before the power failure that had not yet been replicated to the secondary site would be lost. This results in a data loss window of up to 3 hours, exceeding the RPO.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Data loss of up to 3 hours occurred.
Why this is correct
The RPO is 1 hour but failover took 4 hours, causing up to 3 hours of data loss.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The failover process was unsuccessful.
Why it's wrong here
Failover succeeded but with data loss beyond RPO.
✗
No data loss occurred because the secondary site was available.
Why it's wrong here
Data written during the 4-hour outage is lost if not replicated.
✗
The recovery time objective (RTO) was not met.
Why it's wrong here
The RTO is not defined; the problem is data loss beyond RPO.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between RPO (data loss tolerance) and RTO (downtime tolerance), and candidates mistakenly assume that a successful failover means no data loss, ignoring the replication lag.
Detailed technical explanation
How to think about this question
In disaster recovery, RPO is measured by the frequency of data replication (e.g., synchronous vs. asynchronous). If asynchronous replication is used with a 1-hour RPO, the secondary site may lag by up to 1 hour. A 4-hour failover time implies the replication lag could be up to 3 hours beyond the RPO, leading to data loss. Real-world scenarios often involve log shipping or storage-based replication where the last consistent snapshot may be hours old.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Business Continuity, DR & Incident Response — This question tests Business Continuity, DR & Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Data loss of up to 3 hours occurred. — The RPO of 1 hour means the company can tolerate losing up to 1 hour of data. Since the failover took 4 hours, any data written in the 3 hours before the power failure that had not yet been replicated to the secondary site would be lost. This results in a data loss window of up to 3 hours, exceeding the RPO.
What should I do if I get this CC question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "primary". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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