mediumMultiple ChoiceObjective-mapped
CCSP Practice Question: An administrator configured the above key policy…
Exhibit
Refer to the exhibit.
```json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::123456789012:role/BackupRole"
},
"Action": [
"kms:Decrypt",
"kms:ReEncrypt*"
],
"Resource": "*",
"Condition": {
"StringEquals": {
"kms:CallerAccount": "123456789012",
"kms:ViaService": "s3.us-west-2.amazonaws.com"
}
}
}
]
}
```An administrator configured the above key policy for a KMS key used to encrypt S3 backup data. The backup role 'BackupRole' is in the same account. However, when the backup service attempts to use the key to decrypt objects, the operation fails. What is the most likely cause?
⚠ Common exam trap
ISC2 often tests the nuance that 'kms:ViaService' only applies when the request is made through the specified service's integration, not when the client calls KMS directly, leading candidates to overlook the direct API call scenario.
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:ViaService' condition restricts calls to those originating from S3, but the backup service uses direct KMS API
The 'kms:ViaService' condition key restricts KMS API calls to those that originate from a specific AWS service, in this case S3. However, the backup service is likely making direct KMS API calls (e.g., Decrypt) rather than having S3 proxy the request, so the condition fails. The key policy explicitly denies access unless the call comes via S3, which is why decryption fails.
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 principal ARN is incorrect because the role name contains uppercase letters
Why it's wrong here
ARNs are case-sensitive, but the role name appears correct.
- ✓
The 'kms:ViaService' condition restricts calls to those originating from S3, but the backup service uses direct KMS API
Why this is correct
The condition prevents direct KMS calls.
- ✗
The key policy requires a grant token that is not being provided
Why it's wrong here
No grant token required in this policy.
- ✗
The action list does not include 'kms:Decrypt' for S3
Why it's wrong here
Decrypt is included.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.