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    PracticeGCP Professional Cloud ArchitectGCP Professional Cloud Architect Practice Exam 1Question 46
    Medium1 markMultiple Choice
    Subtask 3.1: Design for securityCost OptimizationCompute EngineBilling

    GCP PCA · Question 46 · Design for security

    You are reviewing the GCP billing report for a large enterprise. You notice high costs for Compute Engine. The workloads consist of a baseline of 100 VMs that run 24/7, and an additional 50 VMs that scale up and down dynamically based on daily traffic. Which TWO cost optimization strategies should you apply? (Select TWO)

    Answer options:

    A.

    Purchase Committed Use Discounts (CUDs) for the baseline 100 VMs.

    B.

    Purchase Committed Use Discounts (CUDs) for all 150 VMs.

    C.

    Rely on automatic Sustained Use Discounts (SUDs) for the dynamic 50 VMs.

    D.

    Use Preemptible VMs for the baseline 100 VMs.

    E.

    Move all workloads to Cloud Functions to save money.

    How to approach this question

    Match the discount type to the workload pattern: predictable = CUD, unpredictable/dynamic = SUD.

    Full Answer

    Purchase Committed Use Discounts (CUDs) for the baseline 100 VMs., Rely on automatic Sustained Use Discounts (SUDs) for the dynamic 50 VMs.
    Cost optimization in Compute Engine relies on matching pricing models to workload patterns. For the 100 VMs running 24/7, Committed Use Discounts (CUDs) offer the deepest savings (up to 70%) for a 1 or 3-year commitment. For the 50 dynamic VMs, you shouldn't commit because they scale down. Instead, rely on Sustained Use Discounts (SUDs), which automatically apply discounts the longer a VM runs in a given month.

    Common mistakes

    Over-committing by buying CUDs for peak capacity, resulting in paying for unused resources.
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