This CCSP practice question tests your understanding of cloud data security. 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 uses a Cloud Access Security Broker (CASB) to enforce security policies on SaaS applications. They want to ensure that data uploaded to a file-sharing service does not contain Social Security numbers (SSNs). Which CASB capability is most effective?
Contextual access control
Why wrong: Access control does not examine file content.
Inline DLP scanning
Inline scanning blocks sensitive data in real time.
API-based data discovery
Why wrong: Discovery finds data after it is stored, not prevent upload.
Encryption of data in transit
Why wrong: Encryption does not inspect content.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Inline DLP scanning
Inline DLP scanning is the most effective CASB capability for preventing data containing Social Security numbers from being uploaded to a file-sharing service because it inspects the content of files in real time as they are being uploaded. The CASB acts as a proxy, intercepting the HTTP/HTTPS traffic, parsing the file payload, and applying pattern-matching algorithms (e.g., regex for SSN format) to block the upload before it reaches the SaaS application. This proactive, real-time enforcement is essential for data loss prevention (DLP) at the point of upload.
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.
Contextual access control
Why it's wrong here
Access control does not examine file content.
Inline DLP scanning
Why this is correct
Inline scanning blocks sensitive data in real time.
Related concept
Read the scenario before looking for a memorised answer.
API-based data discovery
Why it's wrong here
Discovery finds data after it is stored, not prevent upload.
Encryption of data in transit
Why it's wrong here
Encryption does not inspect content.
Common exam traps
The trap here is that candidates often confuse API-based data discovery (which is excellent for identifying sensitive data at rest) with inline DLP scanning (which is required for real-time prevention), leading them to choose Option C even though it cannot block the upload in progress.
Detailed technical explanation
Inline DLP scanning in a CASB typically operates as a forward proxy or reverse proxy, terminating the TLS connection from the client, decrypting the traffic, and then re-encrypting it for the SaaS provider. The scanning engine uses regular expressions (e.g., `\b\d{3}-\d{2}-\d{4}\b` for U.S. SSNs) and may also employ entropy checks or checksum validation to reduce false positives. In a real-world scenario, if the CASB is deployed in API mode only, a user could upload a file containing SSNs, and the CASB would only alert or quarantine the file after it is already stored, potentially violating compliance requirements like GDPR or HIPAA.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
The correct answer is: Inline DLP scanning — Inline DLP scanning is the most effective CASB capability for preventing data containing Social Security numbers from being uploaded to a file-sharing service because it inspects the content of files in real time as they are being uploaded. The CASB acts as a proxy, intercepting the HTTP/HTTPS traffic, parsing the file payload, and applying pattern-matching algorithms (e.g., regex for SSN format) to block the upload before it reaches the SaaS application. This proactive, real-time enforcement is essential for data loss prevention (DLP) at the point of upload.
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 24, 2026
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
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