The answer is to create a new CMK every 90 days and update the alias to point to the new key, while applications reference the alias. This is correct because AWS KMS aliases act as mutable pointers that decouple the key identifier from application configuration; when you reassign the alias to a new CMK, applications automatically use the new key without any code changes or downtime, and the previous key versions remain available for decrypting historical data. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of operational efficiency with key rotation—the common trap is choosing manual application updates or key rotation within the same CMK, which either causes downtime or loses access to old data. Remember the mnemonic: “Alias Aligns Access”—the alias aligns the application’s access point with the correct key version, eliminating manual touchpoints and ensuring zero-downtime rotation.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 financial services company uses AWS KMS to encrypt sensitive data. The security team has a requirement to rotate the CMK every 90 days and to maintain a record of all previous key versions for decryption of historical data. The team creates a new CMK every 90 days and manually updates applications to use the new key. This process is error-prone and causes downtime. What is the MOST operationally efficient solution that meets the requirements?
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 CMK every 90 days and update the alias to point to the new key. Applications reference the alias.
Option B is correct because it uses aliases to decouple the key identifier from the application configuration. By creating a new CMK every 90 days and updating the alias to point to the new key, applications that reference the alias automatically use the new key without code changes, eliminating downtime. AWS KMS aliases are mutable pointers that can be reassigned to different CMKs, and the old key versions remain available for decryption of historical data.
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.
✗
Enable automatic key rotation on the existing CMK.
Why it's wrong here
Automatic rotation is only available annually (365 days), not 90 days.
✓
Create a new CMK every 90 days and update the alias to point to the new key. Applications reference the alias.
Why this is correct
Alias updates are immediate and do not require application changes; old keys remain available for decryption.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a CMK with imported key material and rotate the material every 90 days.
Why it's wrong here
Importing key material is more complex and still requires manual rotation.
✗
Continue creating new CMKs but use a script to update the application configuration files.
Why it's wrong here
This still requires manual intervention and downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse automatic key rotation (which only rotates backing keys within the same CMK) with creating a new CMK and using aliases, failing to recognize that automatic rotation does not meet a 90-day schedule and does not create a separate CMK for audit or compliance purposes.
Detailed technical explanation
How to think about this question
Under the hood, AWS KMS aliases are independent resources that can be reassigned to any CMK in the same Region and account using the UpdateAlias API. When an alias is updated, applications that use the alias (e.g., via kms:Encrypt with the alias ARN) immediately start using the new CMK without any code changes. The old CMK remains active and can decrypt data encrypted under it, ensuring historical data remains accessible. This pattern is commonly used in multi-region key strategies and compliance-driven rotation policies.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new CMK every 90 days and update the alias to point to the new key. Applications reference the alias. — Option B is correct because it uses aliases to decouple the key identifier from the application configuration. By creating a new CMK every 90 days and updating the alias to point to the new key, applications that reference the alias automatically use the new key without code changes, eliminating downtime. AWS KMS aliases are mutable pointers that can be reassigned to different CMKs, and the old key versions remain available for decryption of historical data.
What should I do if I get this SCS-C02 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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Question Discussion
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