This DVA-C02 practice question tests your understanding of security. 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.
Which of the following are valid ways to secure access to an Amazon S3 bucket? (Choose TWO.)
Bucket policies
Bucket policies define access permissions for the bucket.
CloudFront distribution
Why wrong: CloudFront is a CDN, not an access control mechanism.
IAM policies
IAM policies grant users or roles access to S3.
Network ACLs
Why wrong: NACLs control traffic at the subnet level, not S3 access.
Security groups
Why wrong: Security groups are used for EC2 instances, not S3.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Bucket policies
Bucket policies are a form of resource-based policy that you attach directly to an S3 bucket. They allow you to grant or deny access to the bucket and its objects for principals (users, roles, or AWS accounts) using the AWS JSON policy language. This is a primary and native way to control access to S3 resources, making option A correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Bucket policies
Why this is correct
Bucket policies define access permissions for the bucket.
Related concept
Read the scenario before looking for a memorised answer.
CloudFront distribution
Why it's wrong here
CloudFront is a CDN, not an access control mechanism.
IAM policies
Why this is correct
IAM policies grant users or roles access to S3.
Related concept
Read the scenario before looking for a memorised answer.
Network ACLs
Why it's wrong here
NACLs control traffic at the subnet level, not S3 access.
Security groups
Why it's wrong here
Security groups are used for EC2 instances, not S3.
Common exam traps
The trap here is that candidates confuse network-level security controls (like NACLs and Security Groups) with resource-level access controls, mistakenly thinking they can be applied to S3 buckets, which are global services not bound to a VPC subnet.
Detailed technical explanation
IAM policies are identity-based policies attached to IAM users, groups, or roles, and they define what actions those identities can perform on S3 resources. When combined with bucket policies, they follow the principle of least privilege and are evaluated using the AWS IAM policy evaluation logic, where an explicit deny in either policy overrides any allow. In practice, you often use IAM policies for fine-grained user permissions and bucket policies for cross-account access or public access controls.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: Bucket policies — Bucket policies are a form of resource-based policy that you attach directly to an S3 bucket. They allow you to grant or deny access to the bucket and its objects for principals (users, roles, or AWS accounts) using the AWS JSON policy language. This is a primary and native way to control access to S3 resources, making option A correct.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DVA-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 DVA-C02 exam.
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