- A
Embed the API key in the client-side JavaScript and rely on CORS policies
Why wrong: Client-side embedding exposes the key to anyone; CORS is not a security mechanism for keys.
- B
Store the API key in the application's source code and use version control to track changes
Why wrong: Hardcoding keys in source code is insecure; they can be exposed in version control.
- C
Apply rate limiting to the API endpoint to prevent excessive usage
Why wrong: Rate limiting limits usage but does not prevent key theft.
- D
Use environment variables to store the API key and implement least-privilege access controls on the server side
Environment variables keep keys out of code, and least-privilege limits exposure.
Question 852 of 1,000
AI0-001 AI Security Practice Question
This AI0-001 practice question tests your understanding of ai 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 integrating an LLM API into a customer-facing application. They want to prevent unauthorized third parties from using the API key. Which of the following is the BEST approach?
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.
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
✓
Use environment variables to store the API key and implement least-privilege access controls on the server side
Using environment variables (or secrets management) and enforcing least-privilege API access, combined with key rotation, is the best practice. Hardcoding is insecure, rate limiting doesn't prevent key theft, and client-side embedding exposes the key.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Embed the API key in the client-side JavaScript and rely on CORS policies
Why it's wrong here
Client-side embedding exposes the key to anyone; CORS is not a security mechanism for keys.
- ✗
Store the API key in the application's source code and use version control to track changes
Why it's wrong here
Hardcoding keys in source code is insecure; they can be exposed in version control.
- ✗
Apply rate limiting to the API endpoint to prevent excessive usage
Why it's wrong here
Rate limiting limits usage but does not prevent key theft.
- ✓
Use environment variables to store the API key and implement least-privilege access controls on the server side
Why this is correct
Environment variables keep keys out of code, and least-privilege limits exposure.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AI0-001 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this AI0-001 question test?
AI Security — This question tests AI Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Use environment variables to store the API key and implement least-privilege access controls on the server side — Using environment variables (or secrets management) and enforcing least-privilege API access, combined with key rotation, is the best practice. Hardcoding is insecure, rate limiting doesn't prevent key theft, and client-side embedding exposes the key.
What should I do if I get this AI0-001 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AI0-001 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jul 4, 2026
This AI0-001 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 AI0-001 exam.
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