PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 uses Cloud Build to build Docker images and push them to Artifact Registry. They want to ensure that only images built from a specific Cloud Build trigger are deployed to production. Which combination of steps should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Binary Authorization with a policy requiring attestation from Cloud Build
Binary Authorization allows attestations that enforce only images built by a specific process (e.g., via Cloud Build) can be deployed. Other options do not tie the deployment to the build source.
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.
✗
Configure IAM roles to restrict push access to Artifact Registry
Why it's wrong here
This controls who can push images, but not which images come from a specific build trigger.
✓
Configure Binary Authorization with a policy requiring attestation from Cloud Build
Why this is correct
Binary Authorization can enforce that only images with a valid attestation from Cloud Build are deployed.
Related concept
Authentication checks who the user is.
✗
Use Cloud Deploy with a manual approval gate
Why it's wrong here
This adds a human approval step but does not verify the image origin.
✗
Use Cloud Build's built-in approval mechanism
Why it's wrong here
Cloud Build does not have a built-in approval mechanism for images.
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 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.
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 PCD questions on access control and AAA configuration.
Building and testing applications — This question tests Building and testing applications — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Configure Binary Authorization with a policy requiring attestation from Cloud Build — Binary Authorization allows attestations that enforce only images built by a specific process (e.g., via Cloud Build) can be deployed. Other options do not tie the deployment to the build source.
What should I do if I get this PCD 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 PCD 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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