DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 building a mobile backend using Amazon API Gateway and AWS Lambda. The API has a single endpoint that accepts POST requests with a JSON payload and stores the data in an Amazon DynamoDB table. The developer wants to implement caching to reduce latency and costs. The data is user-specific and should not be shared between users. The developer configures API Gateway caching with a TTL of 300 seconds. After testing, the developer notices that users are seeing other users' data. What should the developer do to fix this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable cache key parameters in API Gateway, such as the Authorization header.
Option C is correct because enabling cache keys for headers like Authorization ensures cached responses are per-user. Option A is wrong because disabling caching removes benefits. Option B is wrong because DynamoDB is for storage, not caching. Option D is wrong because Lambda@Edge is for CloudFront, not API Gateway caching.
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.
✓
Enable cache key parameters in API Gateway, such as the Authorization header.
Why this is correct
Cache keys ensure that responses are cached per user by including user-specific headers.
Related concept
Authentication checks who the user is.
✗
Store cached responses in DynamoDB and retrieve them based on user ID.
Why it's wrong here
DynamoDB would add latency and complexity; API Gateway caching is designed for this.
✗
Use Lambda@Edge to cache responses at the CloudFront level.
Why it's wrong here
Lambda@Edge can cache but is more complex and not directly related to API Gateway caching.
✗
Disable API Gateway caching and use DynamoDB Accelerator (DAX) instead.
Why it's wrong here
DAX is a cache for DynamoDB, not for API responses, and does not solve user isolation.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 DVA-C02 questions on access control and AAA configuration.
Development with AWS Services — This question tests Development with AWS Services — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enable cache key parameters in API Gateway, such as the Authorization header. — Option C is correct because enabling cache keys for headers like Authorization ensures cached responses are per-user. Option A is wrong because disabling caching removes benefits. Option B is wrong because DynamoDB is for storage, not caching. Option D is wrong because Lambda@Edge is for CloudFront, not API Gateway caching.
What should I do if I get this DVA-C02 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 DVA-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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