← DOP-C02·Amazon Web Services

Question 1,149 of 1,750

Security and Compliance →hardMultiple ChoiceObjective-mapped

DOP-C02 Security and Compliance Practice Question

This DOP-C02 practice question tests your understanding of security and compliance. 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 company runs a critical application on AWS Lambda that processes sensitive data. The security team mandates that all data must be encrypted at rest and in transit. The Lambda function uses an environment variable to store a database password. The DevOps engineer has enabled encryption of environment variables using a KMS CMK. The Lambda function also needs to decrypt the password at runtime. The engineer attaches an IAM role to the Lambda function with permissions to decrypt using the KMS key. However, when the function executes, it fails with an error 'AccessDeniedException' when trying to decrypt the environment variable. The engineer checks the IAM role and confirms that it has kms:Decrypt permission. The KMS key policy allows the root user full access. 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.

A
The KMS key policy does not grant the Lambda execution role permission to use the key.
The KMS key policy does not grant the Lambda execution role permission to use the key. This is the most likely cause because the default key policy allowing root access does not automatically grant access to IAM roles; the role must be explicitly added.
B
The Lambda function code is trying to decrypt the wrong ciphertext.
Why wrong: The Lambda function code is trying to decrypt the wrong ciphertext. This would result in a decryption failure (InvalidCiphertextException), not an AccessDeniedException.
C
The KMS key has been disabled or scheduled for deletion.
Why wrong: The KMS key has been disabled or scheduled for deletion. This would cause a KMSInvalidStateException or similar error, not AccessDenied.
D
The Lambda function is not in a VPC, and the KMS key is restricted to VPC endpoints.
Why wrong: The Lambda function is not in a VPC, and the KMS key is restricted to VPC endpoints. This would cause an AccessDeniedException only if the key policy has a VPC endpoint condition, which is not indicated. The key policy allows root user full access, so this is unlikely.

Full breakdown with real-world context →

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

✓

The KMS key policy does not grant the Lambda execution role permission to use the key.

The AccessDeniedException when decrypting environment variables indicates that the Lambda execution role does not have permission to use the KMS key. Even though the key policy grants root user full access, IAM roles are not automatically included unless explicitly allowed. Option A is correct. Option B would cause a different error (InvalidCiphertextException). Option C would cause a KMSInvalidStateException. Option D is unlikely because the key policy allows root user full access and no VPC endpoint restrictions are mentioned.

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 KMS key policy does not grant the Lambda execution role permission to use the key.
Why this is correct
The KMS key policy does not grant the Lambda execution role permission to use the key. This is the most likely cause because the default key policy allowing root access does not automatically grant access to IAM roles; the role must be explicitly added.
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 Lambda function code is trying to decrypt the wrong ciphertext.
Why it's wrong here
The Lambda function code is trying to decrypt the wrong ciphertext. This would result in a decryption failure (InvalidCiphertextException), not an AccessDeniedException.
✗
The KMS key has been disabled or scheduled for deletion.
Why it's wrong here
The KMS key has been disabled or scheduled for deletion. This would cause a KMSInvalidStateException or similar error, not AccessDenied.
✗
The Lambda function is not in a VPC, and the KMS key is restricted to VPC endpoints.
Why it's wrong here
The Lambda function is not in a VPC, and the KMS key is restricted to VPC endpoints. This would cause an AccessDeniedException only if the key policy has a VPC endpoint condition, which is not indicated. The key policy allows root user full access, so this is unlikely.

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

Similar concept trap
The KMS key has been disabled or scheduled for deletion. This would cause a KMSInvalidStateException or similar error, not AccessDenied.

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.

Related DOP-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Configuration Management and IaC practice questions

Practise DOP-C02 questions linked to Configuration Management and IaC.

Resilient Cloud Solutions practice questions

Practise DOP-C02 questions linked to Resilient Cloud Solutions.

Monitoring and Logging practice questions

Practise DOP-C02 questions linked to Monitoring and Logging.

Incident and Event Response practice questions

Practise DOP-C02 questions linked to Incident and Event Response.

Security and Compliance practice questions

Practise DOP-C02 questions linked to Security and Compliance.

SDLC Automation practice questions

Practise DOP-C02 questions linked to SDLC Automation.

DOP-C02 fundamentals practice questions

Practise DOP-C02 questions linked to DOP-C02 fundamentals.

DOP-C02 scenario practice questions

Practise DOP-C02 questions linked to DOP-C02 scenario.

DOP-C02 troubleshooting practice questions

Practise DOP-C02 questions linked to DOP-C02 troubleshooting.

Practice this exam

Start a free DOP-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

DOP-C02 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this DOP-C02 question test?

Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The KMS key policy does not grant the Lambda execution role permission to use the key. — The AccessDeniedException when decrypting environment variables indicates that the Lambda execution role does not have permission to use the KMS key. Even though the key policy grants root user full access, IAM roles are not automatically included unless explicitly allowed. Option A is correct. Option B would cause a different error (InvalidCiphertextException). Option C would cause a KMSInvalidStateException. Option D is unlikely because the key policy allows root user full access and no VPC endpoint restrictions are mentioned.

What should I do if I get this DOP-C02 question wrong?

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.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This DOP-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 DOP-C02 exam.