CodePipeline Elastic Beanstalk IAM Policy Restrictions
This DVA-C02 practice question tests your understanding of deployment. 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.
A developer is troubleshooting a deployment failure in AWS CodePipeline. The deploy stage uses the above IAM policy for the service role. The pipeline fails when trying to update the Elastic Beanstalk environment. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy restricts the UpdateEnvironment action to a specific environment ARN, but the pipeline is updating a different environment.
The correct answer is A because the IAM policy restricts the elasticbeanstalk:UpdateEnvironment action to a specific environment ARN (arn:aws:elasticbeanstalk:us-east-1:123456789012:environment/MyApp/my-env). If the pipeline is attempting to update a different environment (e.g., due to a change in environment name or region), the action will be denied, causing the deployment to fail. Option B is incorrect because DescribeEnvironmentResources is not required for updates. Option C is incorrect because the policy does not deny all actions; it only denies DeleteEnvironment. Option D is incorrect because DeleteEnvironment is not required for updates.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 policy restricts the UpdateEnvironment action to a specific environment ARN, but the pipeline is updating a different environment.
Why this is correct
The resource ARN must match the environment being updated.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The policy does not allow DescribeEnvironmentResources, which is required for the deployment.
Why it's wrong here
It is allowed.
✗
The policy denies all actions on the environment, preventing the update.
Why it's wrong here
It only denies DeleteEnvironment.
✗
The policy denies DeleteEnvironment, which is required for the update.
Why it's wrong here
DeleteEnvironment is not needed for updates.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
Deployment — This question tests Deployment — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The policy restricts the UpdateEnvironment action to a specific environment ARN, but the pipeline is updating a different environment. — The correct answer is A because the IAM policy restricts the elasticbeanstalk:UpdateEnvironment action to a specific environment ARN (arn:aws:elasticbeanstalk:us-east-1:123456789012:environment/MyApp/my-env). If the pipeline is attempting to update a different environment (e.g., due to a change in environment name or region), the action will be denied, causing the deployment to fail. Option B is incorrect because DescribeEnvironmentResources is not required for updates. Option C is incorrect because the policy does not deny all actions; it only denies DeleteEnvironment. Option D is incorrect because DeleteEnvironment is not required for updates.
What should I do if I get this DVA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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