This DOP-C02 practice question tests your understanding of sdlc automation. 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.
Refer to the exhibit. A developer creates an AWS SAM template with this EventBridge rule to invoke a Lambda function every 10 minutes. After deployment, the rule is created but the Lambda function is not invoked. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: The DeadLetterConfig is optional and is used for failed invocations; it does not prevent the rule from invoking the function.
B
The rule is in DISABLED state.
Why wrong: The exhibit shows State: ENABLED.
C
The Lambda function does not have a resource-based policy allowing EventBridge to invoke it.
In SAM, you need to explicitly grant EventBridge permission to invoke the Lambda function, typically by adding an event source or a permission resource.
D
The schedule expression 'rate(10 minutes)' is invalid; it should be 'rate(10 minute)'.
Why wrong: 'rate(10 minutes)' is a valid expression. The plural 'minutes' is acceptable.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Lambda function does not have a resource-based policy allowing EventBridge to invoke it.
The most likely cause is that the Lambda function lacks a resource-based policy (Lambda permission) that allows EventBridge to invoke it. In AWS SAM, when you define an EventBridge rule as an event source for a Lambda function, you must also add an AWS::Lambda::Permission resource or use the 'FunctionName' property in the event source mapping to grant invocation permission. Without this, EventBridge receives the rule schedule but fails to invoke the function. Option A is incorrect because DeadLetterConfig is optional and not required for invocation. Option B is incorrect because if the rule were disabled, it would not be created or would be inactive; the problem states the rule is created. Option D is incorrect because 'rate(10 minutes)' is a valid schedule expression (both 'minute' and 'minutes' are accepted).
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.
✗
The DeadLetterConfig ARN is incorrect.
Why it's wrong here
The DeadLetterConfig is optional and is used for failed invocations; it does not prevent the rule from invoking the function.
✗
The rule is in DISABLED state.
Why it's wrong here
The exhibit shows State: ENABLED.
✓
The Lambda function does not have a resource-based policy allowing EventBridge to invoke it.
Why this is correct
In SAM, you need to explicitly grant EventBridge permission to invoke the Lambda function, typically by adding an event source or a permission resource.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The schedule expression 'rate(10 minutes)' is invalid; it should be 'rate(10 minute)'.
Why it's wrong here
'rate(10 minutes)' is a valid expression. The plural 'minutes' is acceptable.
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.
Trap categories for this question
Command / output trap
The exhibit shows State: ENABLED.
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 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.
Quick reference
Cloud Service Model Comparison
Model
You Manage
Provider Manages
Examples
IaaS
OS, runtime, apps, data
Hardware, hypervisor, networking
EC2, Azure VMs, GCP Compute Engine
PaaS
Apps and data
OS, runtime, middleware, hardware
Elastic Beanstalk, Azure App Service
SaaS
Data and settings only
Everything else
Microsoft 365, Salesforce, Workday
FaaS / Serverless
Function code only
Infra, scaling, runtime
Lambda, Azure Functions, Cloud Run
CaaS
Containers and apps
Kubernetes, OS, hardware
EKS, AKS, GKE
What to study next
Got this wrong? Here's your next step.
Identify which DOP-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.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function does not have a resource-based policy allowing EventBridge to invoke it. — The most likely cause is that the Lambda function lacks a resource-based policy (Lambda permission) that allows EventBridge to invoke it. In AWS SAM, when you define an EventBridge rule as an event source for a Lambda function, you must also add an AWS::Lambda::Permission resource or use the 'FunctionName' property in the event source mapping to grant invocation permission. Without this, EventBridge receives the rule schedule but fails to invoke the function. Option A is incorrect because DeadLetterConfig is optional and not required for invocation. Option B is incorrect because if the rule were disabled, it would not be created or would be inactive; the problem states the rule is created. Option D is incorrect because 'rate(10 minutes)' is a valid schedule expression (both 'minute' and 'minutes' are accepted).
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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