- A
Create a new KMS key and associate it with the Redshift cluster's subnet group.
Why wrong: Subnet group does not affect encryption key association.
- B
Create a new KMS key with a key policy that grants access only to the Redshift cluster's IAM role.
KMS key can be restricted to a specific role used by Redshift.
- C
Use the default AWS managed KMS key for Redshift.
Why wrong: Not customer-managed.
- D
Use an HSM-backed key from CloudHSM.
Why wrong: Redshift does not support CloudHSM for encryption.
Question 620 of 1,730
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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 company is using Amazon Redshift for data warehousing. The security team requires that all data be encrypted at rest using a customer-managed AWS KMS key. Additionally, the team wants to ensure that the key must be used only for this specific Redshift cluster. Which configuration should be applied?
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 new KMS key with a key policy that grants access only to the Redshift cluster's IAM role.
The correct answer is B. To enforce encryption at rest with a customer-managed AWS KMS key and restrict key usage to a specific Redshift cluster, you create a new KMS key and configure its key policy to grant encrypt/decrypt permissions only to the IAM role associated with the Redshift cluster. This ensures the key is only used by that cluster. Option A is incorrect because associating a key with a subnet group does not limit usage to the cluster; key policies control access. Option C is incorrect because the default AWS managed key is not customer-managed. Option D is incorrect because CloudHSM keys are not directly used with Redshift; KMS is the required service for integration.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 new KMS key and associate it with the Redshift cluster's subnet group.
Why it's wrong here
Subnet group does not affect encryption key association.
- ✓
Create a new KMS key with a key policy that grants access only to the Redshift cluster's IAM role.
Why this is correct
KMS key can be restricted to a specific role used by Redshift.
Related concept
CIDR notation defines the prefix length.
- ✗
Use the default AWS managed KMS key for Redshift.
Why it's wrong here
Not customer-managed.
- ✗
Use an HSM-backed key from CloudHSM.
Why it's wrong here
Redshift does not support CloudHSM for encryption.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DBS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a new KMS key with a key policy that grants access only to the Redshift cluster's IAM role. — The correct answer is B. To enforce encryption at rest with a customer-managed AWS KMS key and restrict key usage to a specific Redshift cluster, you create a new KMS key and configure its key policy to grant encrypt/decrypt permissions only to the IAM role associated with the Redshift cluster. This ensures the key is only used by that cluster. Option A is incorrect because associating a key with a subnet group does not limit usage to the cluster; key policies control access. Option C is incorrect because the default AWS managed key is not customer-managed. Option D is incorrect because CloudHSM keys are not directly used with Redshift; KMS is the required service for integration.
What should I do if I get this DBS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DBS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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