The answer is to restrict Cloud Build trigger creation to specific IAM roles and to avoid storing sensitive data in build configuration files. These two practices directly address the core security principle of least privilege and secret management in CI/CD pipelines. By limiting trigger creation to authorized roles, you prevent unauthorized users from initiating builds that could execute malicious code or access production environments. Similarly, storing secrets like API keys or passwords in build configuration files exposes them in plaintext within the source repository and build logs, violating Google Cloud’s recommendation to use Secret Manager or Cloud KMS. On the Google Professional Cloud Developer exam, this question tests your understanding of Cloud Build’s IAM integration and its lack of native secret encryption—a common trap is assuming Cloud Build encrypts variables by default or that image tags provide secure verification. Remember the mnemonic: “Triggers and secrets, not tags and plaintext” to avoid confusing digest-based image verification with tag-based security.
PCD Deploying applications Practice Question
This PCD practice question tests your understanding of deploying 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.
Which TWO security best practices should be implemented when using Cloud Build to deploy applications? (Choose 2.)
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 Cloud KMS to encrypt sensitive environment variables.
Options A and D are correct. Option A prevents exposure of build secrets. Option D ensures only authorized triggers. Option B is wrong because Cloud Build does not encrypt variables by default. Option C is wrong because Cloud Build verifies images by digest, not tag. Option E is wrong because Cloud Build does not use SSH keys natively.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Add SSH keys to Cloud Build for private Git repos.
Why it's wrong here
Cloud Build uses Cloud Source Repositories or connection via GitHub app.
✓
Use Cloud KMS to encrypt sensitive environment variables.
Why this is correct
Encrypted variables are decrypted at build time.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use container image tags instead of digests in build configs.
Why it's wrong here
Tags can be overwritten; digests ensure immutability.
✗
Store secrets in Cloud Build's default substitution variables.
Why it's wrong here
Not encrypted.
✓
Restrict Cloud Build trigger creation to specific IAM roles.
Why this is correct
Prevents unauthorized build triggers.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCD NAT questions on configuration and troubleshooting.
Deploying applications — This question tests Deploying applications — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use Cloud KMS to encrypt sensitive environment variables. — Options A and D are correct. Option A prevents exposure of build secrets. Option D ensures only authorized triggers. Option B is wrong because Cloud Build does not encrypt variables by default. Option C is wrong because Cloud Build verifies images by digest, not tag. Option E is wrong because Cloud Build does not use SSH keys natively.
What should I do if I get this PCD question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCD NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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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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