Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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 company is deploying a microservices application on Google Kubernetes Engine (GKE). They want to optimize costs without sacrificing availability. They have varying traffic patterns. Which strategy should they recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use node auto-provisioning with preemptible nodes.
Node auto-provisioning with preemptible nodes automatically creates node pools based on workload demands and uses cheaper preemptible VMs, reducing cost for variable traffic. Regional clusters focus on high availability, not cost. Committed use discounts lock in usage and are not optimal for variable traffic. GKE Autopilot provides convenience but may not be the most cost-efficient with preemptible options.
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.
✗
Use committed use discounts with a 3-year term on all nodes.
Why it's wrong here
Committed use discounts require long-term commitment, not suitable for variable traffic patterns.
✗
Use GKE Autopilot with a single node pool.
Why it's wrong here
Autopilot manages nodes but does not inherently optimize cost for variable traffic compared to preemptible nodes.
✗
Use a regional cluster with node pools of different machine types.
Why it's wrong here
Regional clusters provide high availability but increase cost due to multi-zone replication.
✓
Use node auto-provisioning with preemptible nodes.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use node auto-provisioning with preemptible nodes. — Node auto-provisioning with preemptible nodes automatically creates node pools based on workload demands and uses cheaper preemptible VMs, reducing cost for variable traffic. Regional clusters focus on high availability, not cost. Committed use discounts lock in usage and are not optimal for variable traffic. GKE Autopilot provides convenience but may not be the most cost-efficient with preemptible options.
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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Question Discussion
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