The correct answer involves enabling CloudTrail to log all KMS API calls, along with implementing key rotation and granting least privilege access. These three practices form the foundation of KMS key security best practices because they ensure full auditability, limit the blast radius of compromised credentials, and automatically refresh cryptographic material to reduce the risk of key exposure. On the AWS Certified Security Specialty SCS-C02 exam, this topic tests your understanding of the shared responsibility model for key management and the operational controls that prevent unauthorized use. A common trap is assuming that sharing keys across accounts or disabling automatic rotation improves security, but both increase risk—cross-account sharing broadens the attack surface, and disabling rotation leaves keys static and more vulnerable over time. Remember the mnemonic “LAC” for Least privilege, Audit trails, and Change (rotation) to recall the three essential pillars of KMS key security.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 is using AWS KMS to encrypt data in Amazon S3 and Amazon RDS. Which THREE practices should be followed to ensure the security of the KMS keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable automatic key rotation for the KMS keys.
Options A, C, and E are correct. Key rotation is a security best practice. Granting least privilege access limits exposure. Using CloudTrail provides audit trail. Option B is wrong because sharing keys across accounts increases risk. Option D is wrong because disabling automatic rotation may be necessary but is not a security best practice.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Enable automatic key rotation for the KMS keys.
Why this is correct
Rotates backing keys annually.
Related concept
Authentication checks who the user is.
✗
Disable automatic key rotation to maintain control over the key material.
Why it's wrong here
Does not improve security.
✗
Share the KMS key across multiple AWS accounts using cross-account access.
Why it's wrong here
Increases attack surface.
✓
Use IAM policies and key policies to restrict access to the KMS key to only required principals.
Why this is correct
Enforces least privilege.
Related concept
Authentication checks who the user is.
✓
Enable CloudTrail to log all KMS API calls.
Why this is correct
Provides audit trail for key usage.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SCS-C02 questions on access control and AAA configuration.
Data Protection — This question tests Data Protection — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enable automatic key rotation for the KMS keys. — Options A, C, and E are correct. Key rotation is a security best practice. Granting least privilege access limits exposure. Using CloudTrail provides audit trail. Option B is wrong because sharing keys across accounts increases risk. Option D is wrong because disabling automatic rotation may be necessary but is not a security best practice.
What should I do if I get this SCS-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SCS-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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