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CAS-004 Practice Question: A data loss prevention (DLP) solution is being…
A data loss prevention (DLP) solution is being implemented to prevent sensitive data from leaving the corporate network. Which of the following is the most effective approach for detecting structured data like credit card numbers in outbound traffic?
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
✓
Regular expression matching
Regular expressions can match patterns like credit card numbers, while other methods are less precise or suited for different data types.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Keyword matching
Why it's wrong here
Keywords are too generic and may miss structured patterns.
- ✓
Regular expression matching
Why this is correct
Regular expressions can accurately match patterns like credit card number formats.
- ✗
Machine learning classification
Why it's wrong here
Machine learning is better for unstructured data and may have higher false positives.
- ✗
Exact file hash matching
Why it's wrong here
Hash matching detects known files, not data patterns.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 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-005 exam.