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ACE Practice Question: A startup builds a serverless REST API using…
This ACE practice question tests your understanding of a startup builds a serverless rest api using…. 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 startup builds a serverless REST API using Cloud Functions (2nd gen). Each function invocation runs for 200ms on average, processes 5 million requests per day, and uses 256 MB memory. Approximately how should they estimate monthly Cloud Functions costs?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Estimate based on invocation count, compute time (memory × duration), and networking costs beyond the free tier
Cloud Functions billing uses three dimensions: invocations, compute time (measured in GB-seconds), and outbound network traffic — all calculated above the monthly free tier.
B
Distractor review
Approximately $0 — all invocations fall within the free tier
The free tier covers 2M invocations and 400K GB-seconds per month. At 150M invocations and 7.5M GB-seconds, costs far exceed the free tier.
C
Distractor review
Approximately the same as a continuously-running e2-medium VM — Cloud Functions and VMs are priced equivalently
Cloud Functions are priced per-invocation and per-GB-second — very different from per-hour VM pricing. Serverless can be much cheaper or more expensive depending on traffic patterns.
D
Distractor review
Fixed monthly rate based on the number of deployed functions, not invocation count
Cloud Functions pricing is consumption-based (invocations + compute time) — there's no fixed fee per deployed function.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
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Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Estimate based on invocation count, compute time (memory × duration), and networking costs beyond the free tier — Cloud Functions (2nd gen) pricing has three components: invocations (per call), compute time (GB-seconds = memory × duration), and networking. At 5M requests/day × 30 = 150M invocations/month. Compute: 150M × 0.2s × 0.25 GB = 7.5M GB-seconds. The first 2M invocations and 400K GB-seconds are free monthly. Costs are then incurred on excess.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.