Quick Answer
The answer is S3 default encryption, which must be enabled at the bucket level to automatically encrypt new objects at rest. This feature works by applying either SSE-S3 or SSE-KMS to every object uploaded without a specific encryption header, ensuring that all data written to the bucket is encrypted by default. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of how to enforce encryption policies without relying on client-side actions, often appearing in scenarios where compliance mandates automatic protection for new data. A common trap is confusing default encryption with bucket policies that only deny unencrypted uploads—those policies reject non-compliant requests but do not automatically encrypt them, leaving a gap if a client fails to specify encryption. Another pitfall is mixing up Object Lock (for write-once-read-many retention) or versioning (for object history) with encryption. Memory tip: think of default encryption as the bucket’s “auto-encrypt” switch—flip it on, and every new object gets encrypted without any extra effort.
This DOP-C02 practice question tests your understanding of security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 wants to ensure that all S3 buckets are encrypted at rest by default. Which S3 feature should be enabled at the bucket level to automatically encrypt new objects?
S3 Object Lock
Why wrong: Object Lock is for write-once-read-many protection.
Bucket policy with a Deny for unencrypted uploads
Why wrong: This denies unencrypted uploads but does not automatically encrypt.
S3 Versioning
Why wrong: Versioning preserves object versions, not encryption.
Default encryption
Default encryption automatically encrypts new objects.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Default encryption
S3 default encryption allows you to set a default encryption behavior for a bucket, so that all new objects are encrypted at rest automatically. Bucket policies can enforce encryption but do not automatically encrypt. Object lock is for retention. Versioning is for object versions.
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
For each option: why learners choose it and why it is or isn't the right answer here.
S3 Object Lock
Why it's wrong here
Object Lock is for write-once-read-many protection.
Bucket policy with a Deny for unencrypted uploads
Why it's wrong here
This denies unencrypted uploads but does not automatically encrypt.
S3 Versioning
Why it's wrong here
Versioning preserves object versions, not encryption.
Default encryption
Why this is correct
Default encryption automatically encrypts new objects.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
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
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 DOP-C02 ACL questions on filtering logic and placement.
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
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise DOP-C02 questions linked to Configuration Management and IaC.
Practise DOP-C02 questions linked to Resilient Cloud Solutions.
Practise DOP-C02 questions linked to Monitoring and Logging.
Practise DOP-C02 questions linked to Incident and Event Response.
Practise DOP-C02 questions linked to Security and Compliance.
Practise DOP-C02 questions linked to SDLC Automation.
Practise DOP-C02 questions linked to DOP-C02 fundamentals.
Practise DOP-C02 questions linked to DOP-C02 scenario.
Practise DOP-C02 questions linked to DOP-C02 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
The correct answer is: Default encryption — S3 default encryption allows you to set a default encryption behavior for a bucket, so that all new objects are encrypted at rest automatically. Bucket policies can enforce encryption but do not automatically encrypt. Object lock is for retention. Versioning is for object versions.
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 DOP-C02 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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.