The answer is to use GitHub Actions secrets to store the credentials securely. This is correct because GitHub Actions secrets are encrypted at rest and in transit, and they can be scoped to specific repositories or environments, ensuring that only authorized workflows and branches can access them. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of native secret management within CI/CD pipelines, often appearing as a trap where candidates overcomplicate the solution by jumping to Azure Key Vault or managed identities. While Key Vault can be integrated, the primary and simplest secure storage for GitHub Actions is its own secrets feature, which avoids exposing credentials in code or logs. A common memory tip is to remember that GitHub Actions secrets are the first line of defense—think of them as the locked drawer before you consider a vault.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
You are designing a secure CI/CD pipeline for Azure using GitHub Actions. You need to ensure that secrets (e.g., Azure service principal credentials) are stored securely and accessed only by authorized actions. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use GitHub Actions secrets to store the credentials.
Option B is correct because GitHub Actions secrets are encrypted and can be scoped to repositories or environments. Option A is wrong because storing secrets in code is insecure. Option C is wrong because Key Vault can be accessed from GitHub Actions via a secret, but the primary secure storage for GitHub is secrets. Option D is wrong because managed identities are not directly usable in GitHub Actions without a secret to authenticate.
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.
✓
Use GitHub Actions secrets to store the credentials.
Why this is correct
Secrets are encrypted and scoped.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Azure AD managed identities for GitHub Actions.
Why it's wrong here
Managed identities are not supported for GitHub Actions without a secret.
✗
Store secrets in Azure Key Vault and access them using a service principal secret stored in GitHub.
Why it's wrong here
This adds complexity; GitHub secrets are sufficient.
✗
Store secrets as environment variables in the GitHub repository.
Why it's wrong here
Environment variables are not encrypted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use GitHub Actions secrets to store the credentials. — Option B is correct because GitHub Actions secrets are encrypted and can be scoped to repositories or environments. Option A is wrong because storing secrets in code is insecure. Option C is wrong because Key Vault can be accessed from GitHub Actions via a secret, but the primary secure storage for GitHub is secrets. Option D is wrong because managed identities are not directly usable in GitHub Actions without a secret to authenticate.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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