- A
Grant the least privilege to service connections
Least privilege minimizes potential damage.
- B
Use Azure Key Vault to store secrets and fetch them at runtime
Key Vault provides secure secret management.
- C
Use the default hosted agent for all builds
Why wrong: Default agents may have broad access.
- D
Store secrets as plain text in pipeline variables
Why wrong: Plain text secrets are insecure.
- E
Allow contributors to bypass the required reviewer policy
Why wrong: Bypassing reviews weakens security.
Question 725 of 928
Best Practices to Improve Azure DevOps Pipeline Security: Least Privilege and Key Vault
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. 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.
Which TWO practices should you adopt to improve the security of your Azure DevOps pipeline? (Choose two.)
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
✓
Grant the least privilege to service connections
Granting the least privilege to service connections (Option A) is a core security principle that limits the permissions of automated processes to only what is strictly necessary, reducing the blast radius of a compromised connection. Using Azure Key Vault to store secrets and fetch them at runtime (Option B) ensures that sensitive values like API keys and passwords are never exposed in pipeline definitions or logs, and are securely retrieved via managed identities or service principals at execution time.
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.
- ✓
Grant the least privilege to service connections
Why this is correct
Least privilege minimizes potential damage.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use Azure Key Vault to store secrets and fetch them at runtime
Why this is correct
Key Vault provides secure secret management.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use the default hosted agent for all builds
Why it's wrong here
Default agents may have broad access.
- ✗
Store secrets as plain text in pipeline variables
Why it's wrong here
Plain text secrets are insecure.
- ✗
Allow contributors to bypass the required reviewer policy
Why it's wrong here
Bypassing reviews weakens security.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think using default hosted agents is secure because Microsoft manages them, but they overlook the risk of unpatched vulnerabilities or unnecessary software in the default image, and they may also mistakenly believe that storing secrets as pipeline variables is acceptable if they are marked as 'secret' in the UI, when in fact they are still stored in the pipeline's metadata and can be exposed in logs.
Detailed technical explanation
How to think about this question
Azure Key Vault integration with Azure DevOps uses the Azure Resource Manager service connection to authenticate and fetch secrets at pipeline runtime, ensuring that secrets are never stored in the pipeline definition or logs. The least privilege principle for service connections involves scoping permissions to specific Azure resources (e.g., a single resource group) using Azure RBAC, and using service principals with minimal roles rather than full Contributor or Owner access.
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 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.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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.
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Design and implement build and release pipelines — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-400 question test?
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Grant the least privilege to service connections — Granting the least privilege to service connections (Option A) is a core security principle that limits the permissions of automated processes to only what is strictly necessary, reducing the blast radius of a compromised connection. Using Azure Key Vault to store secrets and fetch them at runtime (Option B) ensures that sensitive values like API keys and passwords are never exposed in pipeline definitions or logs, and are securely retrieved via managed identities or service principals at execution time.
What should I do if I get this AZ-400 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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Last reviewed: Jul 4, 2026
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