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 to expose a REST API. The API uses a Lambda authorizer to validate JWT tokens. Recently, the API has been returning 401 Unauthorized errors for valid tokens. The developer notices that the tokens are signed with a new key but the authorizer still uses the old key. What is the MOST efficient way to update the authorizer with the new key?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the Lambda authorizer to fetch the public key from a well-known URL at runtime.
Option A is correct because the Lambda authorizer can retrieve the public key from an external URL (e.g., JWKS endpoint) at runtime, avoiding hardcoded keys. Option B is wrong because recreating the authorizer would cause downtime. Option C is wrong because deploying a new stage does not update the authorizer logic. Option D is wrong because manually updating environment variables requires a function update and is less flexible than fetching keys dynamically.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Modify the Lambda authorizer to fetch the public key from a well-known URL at runtime.
Why this is correct
This allows the authorizer to always use the latest key without manual updates.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the API Gateway stage deployment to redeploy the API.
Why it's wrong here
Redeploying does not update the authorizer's key; it only deploys the current configuration.
✗
Delete and recreate the API Gateway authorizer with the new key.
Why it's wrong here
This causes downtime and is not efficient.
✗
Update the Lambda authorizer's environment variable with the new key and publish a new version.
Why it's wrong here
This works but is less efficient than dynamic key retrieval because it requires manual updates each time the key changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 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.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the Lambda authorizer to fetch the public key from a well-known URL at runtime. — Option A is correct because the Lambda authorizer can retrieve the public key from an external URL (e.g., JWKS endpoint) at runtime, avoiding hardcoded keys. Option B is wrong because recreating the authorizer would cause downtime. Option C is wrong because deploying a new stage does not update the authorizer logic. Option D is wrong because manually updating environment variables requires a function update and is less flexible than fetching keys dynamically.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DVA-C02 practice question is part of Courseiva's free Amazon Web Services 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 DVA-C02 exam.
Question Discussion
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