Google PCA Practice Question: Managing and Provisioning a Solution Infrastructure
This PCA practice question tests your understanding of managing and provisioning a solution infrastructure. 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.
A company uses Cloud Build to deploy a Java application to Artifact Registry. They want to automatically trigger a build only when changes are pushed to the 'main' branch in their Cloud Source Repository. Which configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Cloud Build trigger with an included branch filter set to '^main$'
Cloud Build triggers can be configured with a branch filter (regex) to trigger builds only on specific branches. The trigger is set to watch the repository and fire on push events matching the branch pattern. Using a Cloud Scheduler with Pub/Sub is an alternative for scheduled builds, but not for push-based triggers.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure a Cloud Function that listens for Pub/Sub messages from Cloud Source Repo and calls Cloud Build API
Why it's wrong here
This is overly complex; Cloud Build triggers natively support repository push events.
✓
Create a Cloud Build trigger with an included branch filter set to '^main$'
Why this is correct
The branch filter '^main$' ensures only pushes to the main branch trigger a build.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a Cloud Scheduler job that runs a Pub/Sub push to Cloud Build every hour
Why it's wrong here
This would trigger builds on a schedule, not on pushes to a specific branch.
✗
Use a Cloud Build build step that checks the branch name and aborts if not main
Why it's wrong here
This would still trigger a build on every push, wasting resources. Branch filters are more efficient.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
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 PCA NAT questions on configuration and troubleshooting.
Managing and Provisioning a Solution Infrastructure — This question tests Managing and Provisioning a Solution Infrastructure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a Cloud Build trigger with an included branch filter set to '^main$' — Cloud Build triggers can be configured with a branch filter (regex) to trigger builds only on specific branches. The trigger is set to watch the repository and fire on push events matching the branch pattern. Using a Cloud Scheduler with Pub/Sub is an alternative for scheduled builds, but not for push-based triggers.
What should I do if I get this PCA 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 PCA 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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