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.
An event-driven application uses EventBridge rules to route partner events. Which two design choices improve maintainability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use event patterns that match stable business attributes
Option A is correct because using event patterns that match stable business attributes (e.g., order status, payment type) decouples routing logic from infrastructure details. This means if the underlying service changes its ARN or endpoint, the rule remains valid as long as the business attribute stays the same. It improves maintainability by reducing the need to update rules when non-functional aspects change.
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.
✓
Use event patterns that match stable business attributes
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Put all routing logic in a single Lambda that invokes every target
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✗
Hardcode account root credentials in targets
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✓
Use a custom event bus or partner event source separation where appropriate
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'maintainability' with 'simplicity' and choose a single Lambda function (Option B) thinking it reduces complexity, but in reality it creates a hard-to-maintain monolith that violates AWS best practices for event-driven architectures.
Detailed technical explanation
How to think about this question
EventBridge rules evaluate incoming events against event patterns defined as JSON objects. By using stable business attributes (e.g., `detail-type`, `source`, or custom `detail` fields), you avoid coupling to volatile identifiers like resource ARNs or account IDs. Under the hood, EventBridge performs pattern matching on the event payload; if the pattern matches, the rule routes the event to its targets. A real-world scenario: an e-commerce platform routes 'order.placed' events to a fulfillment service; if the fulfillment service is migrated to a new account, the rule still works because the pattern matches the event's `detail-type`, not the target's ARN.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Use event patterns that match stable business attributes — Option A is correct because using event patterns that match stable business attributes (e.g., order status, payment type) decouples routing logic from infrastructure details. This means if the underlying service changes its ARN or endpoint, the rule remains valid as long as the business attribute stays the same. It improves maintainability by reducing the need to update rules when non-functional aspects change.
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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Question Discussion
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