- A
Store secrets in Cloud Build and use them in build steps.
Why wrong: Secret management is important but not directly related to restricting deployments to main branch.
- B
Use Cloud Build substitutions to inject environment variables.
Why wrong: Substitutions are useful for parameterization but do not restrict deployment to main branch.
- C
Use branch triggers to run tests only on push to main.
This ensures the pipeline only executes when changes are made to the main branch.
- D
Use Cloud Build's inverted match with branch pattern to exclude non-main branches.
Why wrong: Inverted match is not a typical approach and can be confusing; branch triggers are standard.
- E
Use a manual approval step in Cloud Deploy before promoting to production.
Manual approval prevents automatic deployment of any code, including from main, without review.
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 team is setting up a CI/CD pipeline using Cloud Build for a Node.js application. They want to ensure that only code from the main branch is deployed to production. Which TWO practices should they implement?
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
Use branch triggers to run tests only on push to main.
Using a branch trigger that runs only on push to main ensures that only main branch code triggers the pipeline. Adding a manual approval step in Cloud Deploy before promoting to production adds a gate to prevent automatic deployment of untested code. Storing secrets or using substitutions are good practices but do not specifically restrict deployment to the main branch.
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.
- ✗
Store secrets in Cloud Build and use them in build steps.
Why it's wrong here
Secret management is important but not directly related to restricting deployments to main branch.
- ✗
Use Cloud Build substitutions to inject environment variables.
Why it's wrong here
Substitutions are useful for parameterization but do not restrict deployment to main branch.
- ✓
Use branch triggers to run tests only on push to main.
Why this is correct
This ensures the pipeline only executes when changes are made to the main branch.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Use Cloud Build's inverted match with branch pattern to exclude non-main branches.
Why it's wrong here
Inverted match is not a typical approach and can be confusing; branch triggers are standard.
- ✓
Use a manual approval step in Cloud Deploy before promoting to production.
Why this is correct
Manual approval prevents automatic deployment of any code, including from main, without review.
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.
Trap categories for this question
Similar concept trap
Inverted match is not a typical approach and can be confusing; branch triggers are standard.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this PCD question test?
Building and testing applications — This question tests Building and testing applications — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use branch triggers to run tests only on push to main. — Using a branch trigger that runs only on push to main ensures that only main branch code triggers the pipeline. Adding a manual approval step in Cloud Deploy before promoting to production adds a gate to prevent automatic deployment of untested code. Storing secrets or using substitutions are good practices but do not specifically restrict deployment to the main branch.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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