This CAS-004 practice question tests your understanding of application environment, configuration and 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 developer is writing a mobile app that stores sensitive user data locally on the device. Which is the best practice for protecting the data at rest?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Use SQLite without encryption
Why wrong: Unencrypted SQLite databases are accessible via file system.
Use the device's keychain/keystore with encryption
Keychain/keystore uses hardware-backed encryption for secure local storage.
Store data in a remote database only
Why wrong: Not always feasible; app may need offline access.
Store data in plain XML files
Why wrong: Plain XML is unencrypted and easily readable.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use the device's keychain/keystore with encryption
Option A is correct because using the device's keychain/keystore provides encrypted storage. Option B (plain XML) is insecure; Option C (SQLite without encryption) exposes data; Option D (remote database only) prevents offline access and may not be feasible.
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.
Use SQLite without encryption
Why it's wrong here
Unencrypted SQLite databases are accessible via file system.
Use the device's keychain/keystore with encryption
Why this is correct
Keychain/keystore uses hardware-backed encryption for secure local storage.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Store data in a remote database only
Why it's wrong here
Not always feasible; app may need offline access.
Store data in plain XML files
Why it's wrong here
Plain XML is unencrypted and easily readable.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: Use the device's keychain/keystore with encryption — Option A is correct because using the device's keychain/keystore provides encrypted storage. Option B (plain XML) is insecure; Option C (SQLite without encryption) exposes data; Option D (remote database only) prevents offline access and may not be feasible.
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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