The correct answer is to store source code in Cloud Source Repositories with IAM restrictions, as this ensures that only authorized users can access and modify your application’s codebase, directly enforcing the principle of least privilege. This practice is a core component of building secure applications on Google Cloud because it prevents unauthorized code changes and integrates with Cloud IAM for fine-grained access control, which is essential for maintaining a secure software supply chain. On the Google Professional Cloud Developer exam, this concept tests your understanding of how to combine source control with identity management to mitigate risks like insider threats or accidental exposure. A common trap is to overlook IAM restrictions and rely solely on repository visibility settings, but the exam emphasizes that IAM policies are the definitive control for access. Remember the mnemonic “Code Locked, Access Blocked” to recall that secure coding starts with locking down your source repositories.
PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. 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.
Which THREE of the following are best practices for building secure applications on Google Cloud?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Secret Manager to manage sensitive configuration values.
Option A is correct because Secret Manager provides a centralized and secure way to store and manage sensitive configuration values such as API keys, database passwords, and certificates. By using Secret Manager, you avoid hardcoding secrets in source code or configuration files, reducing the risk of exposure. It integrates with IAM for fine-grained access control and supports automatic rotation, ensuring that secrets are protected at rest and in transit.
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 Secret Manager to manage sensitive configuration values.
Why this is correct
Secret Manager securely stores and accesses secrets.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable authentication on a test Cloud Run service for end-user testing.
Why it's wrong here
Disabling auth exposes service to public.
✗
Use a single service account for all Cloud Functions to simplify permissions.
Why it's wrong here
Shared service account reduces security.
✓
Enable VPC Service Controls to prevent data exfiltration.
Why this is correct
VPC-SC provides ingress/egress controls.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Store source code in Cloud Source Repositories with IAM restrictions.
Why this is correct
IAM controls access to source code.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the principle of least privilege and the misconception that simplifying permissions by using a single service account is acceptable, when in fact it creates a single point of failure and broad attack surface.
Detailed technical explanation
How to think about this question
Secret Manager uses envelope encryption with Cloud KMS, where each secret is encrypted with a data encryption key (DEK) that is itself encrypted by a key encryption key (KEK) managed in Cloud KMS. This allows for efficient encryption and decryption while maintaining strong key management. In a real-world scenario, a microservices architecture might use Secret Manager to store database credentials, and each service retrieves only its own secrets via IAM roles, ensuring that a compromised service cannot access secrets belonging to other services.
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.
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.
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Secret Manager to manage sensitive configuration values. — Option A is correct because Secret Manager provides a centralized and secure way to store and manage sensitive configuration values such as API keys, database passwords, and certificates. By using Secret Manager, you avoid hardcoding secrets in source code or configuration files, reducing the risk of exposure. It integrates with IAM for fine-grained access control and supports automatic rotation, ensuring that secrets are protected at rest and in transit.
What should I do if I get this PCD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCD 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 PCD exam.
Question Discussion
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