- A
Store the Git repository in Cloud Source Repositories and use IAM to control access. Use branch protection rules to require pull request approvals before merging to the main branch.
IAM controls who can access the repo. Branch protection ensures only reviewed changes are merged. Config Sync automatically applies the main branch.
- B
Use a public Git repository and rely on Kubernetes RBAC to control who can modify Config Sync objects.
Why wrong: A public repo exposes configuration to everyone; RBAC only controls access to the cluster, not the repo.
- C
Use a separate Git repository for each cluster and restrict access via SSH keys.
Why wrong: While this provides isolation, branch protection is still needed. The recommendation is to use Cloud Source Repositories with IAM.
- D
Encrypt the Kubernetes secrets in the repo and use a KMS key to decrypt them in the cluster.
Why wrong: Encryption protects secrets but does not prevent unauthorized changes to the configuration.
PCDE Practice Question: Building and Implementing CI/CD Pipelines for a Service
This PCDE practice question tests your understanding of building and implementing ci/cd pipelines for a service. 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.
An organization is implementing GitOps using Config Sync. They have a Git repository containing Kubernetes manifests for multiple GKE clusters. They want to ensure that only authorized engineers can modify the configuration and that changes are automatically applied to clusters. What is the recommended way to secure Config Sync?
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
Store the Git repository in Cloud Source Repositories and use IAM to control access. Use branch protection rules to require pull request approvals before merging to the main branch.
Config Sync uses a Git repo. The best practice is to use a private repo and grant least-privilege access. To prevent unauthorized changes, enforce branch protection rules (e.g., require PR approvals) and use a service account with read-only access to the repo. Config Sync's reconciler runs in the cluster with read-only permissions.
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.
- ✓
Store the Git repository in Cloud Source Repositories and use IAM to control access. Use branch protection rules to require pull request approvals before merging to the main branch.
Why this is correct
IAM controls who can access the repo. Branch protection ensures only reviewed changes are merged. Config Sync automatically applies the main branch.
Related concept
Authentication checks who the user is.
- ✗
Use a public Git repository and rely on Kubernetes RBAC to control who can modify Config Sync objects.
Why it's wrong here
A public repo exposes configuration to everyone; RBAC only controls access to the cluster, not the repo.
- ✗
Use a separate Git repository for each cluster and restrict access via SSH keys.
Why it's wrong here
While this provides isolation, branch protection is still needed. The recommendation is to use Cloud Source Repositories with IAM.
- ✗
Encrypt the Kubernetes secrets in the repo and use a KMS key to decrypt them in the cluster.
Why it's wrong here
Encryption protects secrets but does not prevent unauthorized changes to the configuration.
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 PCDE questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this PCDE question test?
Building and Implementing CI/CD Pipelines for a Service — This question tests Building and Implementing CI/CD Pipelines for a Service — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Store the Git repository in Cloud Source Repositories and use IAM to control access. Use branch protection rules to require pull request approvals before merging to the main branch. — Config Sync uses a Git repo. The best practice is to use a private repo and grant least-privilege access. To prevent unauthorized changes, enforce branch protection rules (e.g., require PR approvals) and use a service account with read-only access to the repo. Config Sync's reconciler runs in the cluster with read-only permissions.
What should I do if I get this PCDE 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 PCDE 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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Last reviewed: Jul 4, 2026
This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.
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