- A
Create a bucket policy in Account A that grants access to the IAM user ARNs from Account B.
Why wrong: Bucket policies alone cannot grant access to users in another account without explicit IAM permissions in that account.
- B
Create a KMS key in Account A and share it with Account B to decrypt objects.
Why wrong: KMS handles encryption, not access to S3 operations.
- C
Create a bucket policy in Account A granting access to the root user of Account B, and create an IAM policy in Account B allowing the users to access the bucket.
This is the standard cross-account S3 access pattern.
- D
Create an IAM role in Account A with trust policy allowing Account B to assume it, and attach a policy granting S3 access.
Why wrong: This works but requires users to assume the role, adding complexity.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 DevOps engineer needs to grant cross-account access to an S3 bucket in Account A for users in Account B. The users in Account B must be able to list objects and read them. What is the most secure way to configure this access?
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
Create a bucket policy in Account A granting access to the root user of Account B, and create an IAM policy in Account B allowing the users to access the bucket.
Option C is correct because it combines a bucket policy in Account A granting access to Account B's root or specific ARN, and an IAM policy in Account B allowing users to access that bucket. Option A is wrong because a bucket policy alone is insufficient; Account B users also need IAM permissions. Option B is wrong because an IAM role in Account A with a trust policy from Account B is a common pattern, but the question specifies users in Account B, so the role approach works but requires users to assume the role; option C is more direct for S3 access. Option D is wrong because KMS is for encryption, not access control.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a bucket policy in Account A that grants access to the IAM user ARNs from Account B.
Why it's wrong here
Bucket policies alone cannot grant access to users in another account without explicit IAM permissions in that account.
- ✗
Create a KMS key in Account A and share it with Account B to decrypt objects.
Why it's wrong here
KMS handles encryption, not access to S3 operations.
- ✓
Create a bucket policy in Account A granting access to the root user of Account B, and create an IAM policy in Account B allowing the users to access the bucket.
Why this is correct
This is the standard cross-account S3 access pattern.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Create an IAM role in Account A with trust policy allowing Account B to assume it, and attach a policy granting S3 access.
Why it's wrong here
This works but requires users to assume the role, adding complexity.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
- →
Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
- →
Security and Compliance practice questions
Targeted practice on this topic area only
- →
All DOP-C02 questions
1,740 questions across all exam domains
- →
AWS Certified DevOps Engineer Professional DOP-C02 study guide
Full concept coverage aligned to exam objectives
- →
DOP-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
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.
FAQ
Questions learners often ask
What does this DOP-C02 question test?
Security and Compliance — This question tests Security and Compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a bucket policy in Account A granting access to the root user of Account B, and create an IAM policy in Account B allowing the users to access the bucket. — Option C is correct because it combines a bucket policy in Account A granting access to Account B's root or specific ARN, and an IAM policy in Account B allowing users to access that bucket. Option A is wrong because a bucket policy alone is insufficient; Account B users also need IAM permissions. Option B is wrong because an IAM role in Account A with a trust policy from Account B is a common pattern, but the question specifies users in Account B, so the role approach works but requires users to assume the role; option C is more direct for S3 access. Option D is wrong because KMS is for encryption, not access control.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
Last reviewed: Jun 20, 2026
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.
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.
Sign in to join the discussion.