- A
Enable API Gateway caching
API Gateway caching caches the responses from the backend integration for a set TTL, significantly reducing the number of identical requests reaching the backend.
- B
Implement caching in the Lambda function using a local cache
Why wrong: Local caching in Lambda can reduce compute, but it does not offload the API Gateway layer and is not as efficient as API Gateway caching for repeated requests.
- C
Use an Amazon ElastiCache Redis cluster and modify the Lambda function to check the cache first
Why wrong: This adds complexity and latency for each cache check; API Gateway caching is simpler and fully managed.
- D
Place an Amazon CloudFront distribution in front of API Gateway
Why wrong: CloudFront can cache at the edge, but it is more suitable for static content or when you need additional caching layers; API Gateway caching is more direct.
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 developer is designing a REST API using Amazon API Gateway that experiences high traffic with many repeated requests for the same data. The developer wants to reduce backend load and improve response times. Which feature should the developer enable on the API Gateway method?
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
Enable API Gateway caching
API Gateway caching stores responses from backend endpoints for a configurable Time-to-Live (TTL). When a request for the same data arrives, API Gateway serves the cached response directly without invoking the backend, reducing load and improving latency. This is the most straightforward and managed solution for repeated requests at the API layer.
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.
- ✓
Enable API Gateway caching
Why this is correct
API Gateway caching caches the responses from the backend integration for a set TTL, significantly reducing the number of identical requests reaching the backend.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Implement caching in the Lambda function using a local cache
Why it's wrong here
Local caching in Lambda can reduce compute, but it does not offload the API Gateway layer and is not as efficient as API Gateway caching for repeated requests.
- ✗
Use an Amazon ElastiCache Redis cluster and modify the Lambda function to check the cache first
Why it's wrong here
This adds complexity and latency for each cache check; API Gateway caching is simpler and fully managed.
- ✗
Place an Amazon CloudFront distribution in front of API Gateway
Why it's wrong here
CloudFront can cache at the edge, but it is more suitable for static content or when you need additional caching layers; API Gateway caching is more direct.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overcomplicate the solution by choosing a distributed cache like ElastiCache or a CDN like CloudFront, when the simplest and most cost-effective managed service (API Gateway caching) directly addresses the requirement at the API layer.
Detailed technical explanation
How to think about this question
API Gateway caching uses a dedicated cache cluster per stage, with configurable memory sizes from 0.5 GB to 237 GB. The cache key is derived from the method's request parameters (e.g., query strings, headers, path parameters) and the TTL defaults to 300 seconds but can be set between 0 and 3600 seconds. A subtle behavior is that enabling caching invalidates the entire cache for the stage, so plan cache flushes during low-traffic windows.
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.
TExam Day Tips
- 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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Enable API Gateway caching — API Gateway caching stores responses from backend endpoints for a configurable Time-to-Live (TTL). When a request for the same data arrives, API Gateway serves the cached response directly without invoking the backend, reducing load and improving latency. This is the most straightforward and managed solution for repeated requests at the API layer.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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