The answer is to purchase committed use discounts for the relevant machine types and regions. This is correct because committed use discounts, or CUDs, offer substantial cost reduction for predictable, steady-state workloads by locking in a 1- or 3-year commitment in exchange for lower per-hour rates, making them ideal for a six-month batch processing job that runs continuously. On the Google Professional Cloud Security Engineer exam, this question tests your ability to differentiate cost optimization strategies without sacrificing performance, often appearing as a trap where candidates confuse CUDs with preemptible VMs or custom machine types. A common mistake is choosing preemptible VMs for long-running batch workloads, but remember that preemptible instances can be terminated at any time, making them unreliable for sustained processing. Memory tip: think of CUDs as a “commitment contract” for steady savings, while preemptible VMs are “discounts with a catch.”
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. 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 runs a batch processing workload on Compute Engine VMs for 6 months. They want to reduce costs without sacrificing performance. Which option should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Purchase committed use discounts for the relevant machine types and regions
Option A is correct because committed use discounts (CUDs) provide significant discounts in exchange for a 1- or 3-year commitment, ideal for steady-state workloads. Option B is wrong because preemptible VMs are not suitable for long-running batch jobs due to termination risk. Option C is wrong because custom machine types may optimize resource use but do not offer discounts like CUDs. Option D is wrong because sole-tenant nodes isolate VMs but do not reduce costs.
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.
✗
Switch to preemptible VMs
Why it's wrong here
Preemptible VMs can be terminated at any time, making them unsuitable for batch jobs that require completion.
✗
Use sole-tenant nodes to share resources across projects
Why it's wrong here
Sole-tenant nodes are for compliance or licensing, not cost reduction; they often cost more.
✗
Migrate to custom machine types to eliminate wasted resources
Why it's wrong here
Custom machine types optimize sizing but do not provide the cost savings of committed use discounts.
✓
Purchase committed use discounts for the relevant machine types and regions
Why this is correct
CUDs offer up to 57% discount for stable workloads with a commitment, directly reducing costs.
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.
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 PCSE NAT questions on configuration and troubleshooting.
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Purchase committed use discounts for the relevant machine types and regions — Option A is correct because committed use discounts (CUDs) provide significant discounts in exchange for a 1- or 3-year commitment, ideal for steady-state workloads. Option B is wrong because preemptible VMs are not suitable for long-running batch jobs due to termination risk. Option C is wrong because custom machine types may optimize resource use but do not offer discounts like CUDs. Option D is wrong because sole-tenant nodes isolate VMs but do not reduce costs.
What should I do if I get this PCSE 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 PCSE 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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