Quick Answer
The correct answer is a preventive control failure because the organization lacked a technical safeguard, such as Data Loss Prevention (DLP) rules or email content filtering, to block the outbound transmission of confidential financial data. Preventive controls are designed to stop unauthorized actions before they happen, and the absence of such a mechanism allowed the accidental email to be sent—this is a classic data classification control failure where policy existed but enforcement did not. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to distinguish preventive controls from detective or corrective ones; a common trap is to confuse a missing preventive control with a detection failure, but remember that detection only alerts after the event, while prevention stops it entirely. To lock it in, think of the mnemonic “Prevent before you detect”—if the data left, prevention failed.
This CAS-004 practice question tests your understanding of governance, risk and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 data classification policy labels all financial data as 'Confidential.' An employee accidentally emails a spreadsheet containing customer payment information to an unauthorized external party. Which type of control failure occurred?
Preventive control failure
A DLP solution should have prevented the email
Corrective control failure
Why wrong: Corrective controls activate after an incident
Administrative control failure
Why wrong: Policy existed but was not enforced
Detective control failure
Why wrong: Detection occurs after the event
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Preventive control failure
A preventive control failure occurred because the organization lacked a technical safeguard—such as Data Loss Prevention (DLP) rules, email content filtering, or mandatory access controls—to block the outbound transmission of confidential financial data. Preventive controls are designed to stop unauthorized actions before they happen, and the absence of such a mechanism allowed the accidental email to be sent. The failure is not in detection or correction, but in the inability to prevent the data exfiltration at the point of transmission.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Preventive control failure
Why this is correct
A DLP solution should have prevented the email
Related concept
Read the scenario before looking for a memorised answer.
Corrective control failure
Why it's wrong here
Corrective controls activate after an incident
Administrative control failure
Why it's wrong here
Policy existed but was not enforced
Detective control failure
Why it's wrong here
Detection occurs after the event
Common exam traps
The trap here is that candidates confuse the existence of a policy (administrative control) with the technical enforcement of that policy, leading them to incorrectly select 'Administrative control failure' when the real issue is the lack of a preventive technical control.
Detailed technical explanation
In practice, a DLP solution (e.g., Symantec DLP, Microsoft Purview) would inspect email content for patterns like credit card numbers (Luhn algorithm validation) or financial account numbers (e.g., IBAN structure) and apply a rule to block or quarantine the message. Without such a control, the email passed through the SMTP gateway unchecked, representing a gap in the preventive control layer. This aligns with the NIST SP 800-53 control family AC-3 (Access Enforcement) and SC-7 (Boundary Protection), which mandate technical mechanisms to enforce data flow policies.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Governance, Risk and Compliance — This question tests Governance, Risk and Compliance — Read the scenario before looking for a memorised answer..
The correct answer is: Preventive control failure — A preventive control failure occurred because the organization lacked a technical safeguard—such as Data Loss Prevention (DLP) rules, email content filtering, or mandatory access controls—to block the outbound transmission of confidential financial data. Preventive controls are designed to stop unauthorized actions before they happen, and the absence of such a mechanism allowed the accidental email to be sent. The failure is not in detection or correction, but in the inability to prevent the data exfiltration at the point of transmission.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-004 exam.
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