PCDOE Building and implementing CI/CD pipelines Practice Question
This PCDOE practice question tests your understanding of building and implementing ci/cd pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Deploy for continuous delivery to GKE. They have a delivery pipeline with a rollout strategy: canary (25% for 30m) then full. The canary rollout fails because the new revision's health check errors. The team wants to automatically rollback the canary and notify. What native GCP feature can achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a Cloud Deploy rollout strategy with an automated rollback policy.
Option A is correct because Cloud Deploy supports automated rollback via the rollbackPolicy in the delivery pipeline. Option B is incorrect because Cloud Build triggers are not designed for rollback automation. Option C is incorrect because post-deploy hooks are not for rollbacks. Option D is incorrect because it requires custom scripting and is not as native as Cloud Deploy's feature.
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 Cloud Monitoring alerting policy on deployment errors that triggers a Cloud Function to rollback.
Why it's wrong here
This is manual and less reliable than the native rollback feature.
✗
Set up a Cloud Build trigger that detects deployment failure and runs a rollback.
Why it's wrong here
This is possible but not native; Cloud Deploy offers built-in rollback.
✓
Configure a Cloud Deploy rollout strategy with an automated rollback policy.
Why this is correct
Cloud Deploy can automatically rollback a rollout on failure by setting rollbackPolicy to ALWAYS or ON_FAILURE.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a Cloud Deploy rollout strategy with a post-deploy hook that calls Cloud Run jobs to revert.
Why it's wrong here
Post-deploy hooks are for actions after deployment, not automated rollback.
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.
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 PCDOE NAT questions on configuration and troubleshooting.
Building and implementing CI/CD pipelines — This question tests Building and implementing CI/CD pipelines — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure a Cloud Deploy rollout strategy with an automated rollback policy. — Option A is correct because Cloud Deploy supports automated rollback via the rollbackPolicy in the delivery pipeline. Option B is incorrect because Cloud Build triggers are not designed for rollback automation. Option C is incorrect because post-deploy hooks are not for rollbacks. Option D is incorrect because it requires custom scripting and is not as native as Cloud Deploy's feature.
What should I do if I get this PCDOE 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 PCDOE 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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Question Discussion
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