DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 Amazon API Gateway with a Lambda authorizer to secure its APIs. The authorizer must verify a JWT token from a third-party identity provider. The team notices that the authorizer is called on every API request, causing additional latency. How can the team reduce the number of authorizer invocations?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Lambda authorizer to return a cached policy using the 'methodArn' and 'principalId' combination.
Option C is correct because enabling token caching in the Lambda authorizer reduces invocations. Option A is wrong because the TTL in API Gateway caching is for response caching, not authorizer caching. Option B is wrong because caching in CloudFront is for content, not authorization. Option D is wrong because the Lambda authorizer is the intended mechanism; removing it would bypass security.
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.
✗
Use Amazon CloudFront to cache the API responses.
Why it's wrong here
CloudFront caches HTTP responses, not authorization.
✓
Configure the Lambda authorizer to return a cached policy using the 'methodArn' and 'principalId' combination.
Why this is correct
Lambda authorizer supports caching based on the token.
Related concept
Authentication checks who the user is.
✗
Enable API Gateway caching and set a TTL of 300 seconds.
Why it's wrong here
API Gateway caching caches responses, not authorization decisions.
✗
Remove the Lambda authorizer and use IAM roles for authorization.
Why it's wrong here
This would change the auth mechanism and may not work with JWT.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Configure the Lambda authorizer to return a cached policy using the 'methodArn' and 'principalId' combination. — Option C is correct because enabling token caching in the Lambda authorizer reduces invocations. Option A is wrong because the TTL in API Gateway caching is for response caching, not authorizer caching. Option B is wrong because caching in CloudFront is for content, not authorization. Option D is wrong because the Lambda authorizer is the intended mechanism; removing it would bypass security.
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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