This CCSP practice question tests your understanding of cloud data 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It denies all PutObject requests that do not specify an encryption header, enforcing encryption at rest.
The bucket policy uses a condition key `s3:x-amz-server-side-encryption` with a `StringNotEquals` condition to deny `PutObject` requests that do not include the `x-amz-server-side-encryption` header set to `AES256`. This effectively denies any upload that does not specify server-side encryption with S3-Managed Keys (SSE-S3), enforcing encryption at rest for all objects written to the bucket.
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.
✗
It denies all PutObject requests, regardless of encryption.
Why it's wrong here
Incorrect: The policy only denies when the encryption header is missing; if present, the deny condition is not met.
✓
It denies all PutObject requests that do not specify an encryption header, enforcing encryption at rest.
Why this is correct
Correct: The Deny with Null condition blocks requests where the encryption header is null (missing), thus requiring encryption.
Related concept
Read the scenario before looking for a memorised answer.
✗
It allows only PutObject requests using SSE-KMS (AWS KMS managed keys).
Why it's wrong here
Incorrect: The policy does not specify a particular encryption type; it only requires any encryption header.
✗
It allows PutObject requests only from principals that use an IAM role with encryption permissions.
Why it's wrong here
Incorrect: The policy does not reference IAM roles; it is a bucket policy that evaluates the encryption header.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between SSE-S3 (`AES256`) and SSE-KMS (`aws:kms`) in bucket policy conditions, leading candidates to confuse the required header value and incorrectly select an option involving KMS.
Detailed technical explanation
How to think about this question
The `s3:x-amz-server-side-encryption` condition key evaluates the `x-amz-server-side-encryption` header in the request. When set to `AES256`, it instructs S3 to use SSE-S3, where Amazon manages the encryption keys. A common subtlety is that this condition does not enforce encryption for objects uploaded via multipart uploads unless the header is included in each part; however, the policy as written applies to `PutObject`, which covers standard uploads but not `CreateMultipartUpload` unless explicitly included.
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.
TExam Day Tips
→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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It denies all PutObject requests that do not specify an encryption header, enforcing encryption at rest. — The bucket policy uses a condition key `s3:x-amz-server-side-encryption` with a `StringNotEquals` condition to deny `PutObject` requests that do not include the `x-amz-server-side-encryption` header set to `AES256`. This effectively denies any upload that does not specify server-side encryption with S3-Managed Keys (SSE-S3), enforcing encryption at rest for all objects written to the bucket.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
Question Discussion
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