Google PCA Practice Question: Designing and Planning a Cloud Solution Architecture
This PCA practice question tests your understanding of designing and planning a cloud solution architecture. 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 wants to run batch processing workloads that can be interrupted and resumed, at the lowest possible cost. The jobs are fault-tolerant and can handle preemption. They also need predictable pricing for a baseline amount of compute. Which combination of compute options 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
✓
Use committed use discounts for baseline capacity and preemptible VMs for additional burst capacity
Preemptible VMs (or Spot VMs) are significantly cheaper but can be terminated at any time. Committed use discounts provide a discount for a 1- or 3-year commitment. Using committed use discounts for a baseline ensures predictable pricing, and using preemptible VMs for additional capacity reduces cost further. Sustained use discounts apply automatically but are not as cost-effective as committed discounts for predictable baseline. Standard VMs are more expensive.
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 spot VMs for all workloads and rely on automatic restart
Why it's wrong here
Spot VMs can be interrupted; with no baseline, workload may not have guaranteed capacity.
✗
Use standard VMs with sustained use discounts
Why it's wrong here
Sustained use discounts are automatic but less cost-effective than committed use discounts for a predictable baseline.
✗
Use only preemptible VMs for all workloads
Why it's wrong here
Preemptible VMs may not be available when needed; they cannot provide a guaranteed baseline.
✓
Use committed use discounts for baseline capacity and preemptible VMs for additional burst capacity
Why this is correct
Committed use discounts give predictable pricing for baseline; preemptible VMs are cheap for additional capacity.
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 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.
Designing and Planning a Cloud Solution Architecture — This question tests Designing and Planning a Cloud Solution Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use committed use discounts for baseline capacity and preemptible VMs for additional burst capacity — Preemptible VMs (or Spot VMs) are significantly cheaper but can be terminated at any time. Committed use discounts provide a discount for a 1- or 3-year commitment. Using committed use discounts for a baseline ensures predictable pricing, and using preemptible VMs for additional capacity reduces cost further. Sustained use discounts apply automatically but are not as cost-effective as committed discounts for predictable baseline. Standard VMs are more expensive.
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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