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ACE Practice Question: Designing a data pipeline that reads from Cloud…
This ACE practice question tests your understanding of designing a data pipeline that reads from cloud…. 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.
You are designing a data pipeline that reads from Cloud Storage, transforms data, and writes to BigQuery. The pipeline must process data exactly when new files land (event-driven), handle files up to 5 GB, and complete within 10 minutes. Which approach best meets these requirements?
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
Configure a Cloud Storage Pub/Sub notification → Cloud Function that launches a Dataflow job for each new file.
GCS object notifications to Pub/Sub trigger a Cloud Function that launches a Dataflow job. Dataflow handles files up to 5 GB within 10 minutes using parallel workers, and the event-driven architecture processes files exactly when they land.
B
Distractor review
Use a Cloud Scheduler cron job that scans Cloud Storage every minute and processes new files with Dataflow.
Polling every minute adds up to 60-second latency per file and processes files on a schedule, not event-driven. It also creates unnecessary scans when no files arrive.
C
Distractor review
Use BigQuery Data Transfer Service to load files from Cloud Storage on a schedule.
BigQuery Data Transfer Service loads data on a schedule (minimum 15-minute intervals), not event-driven. It doesn't support custom transformation logic during load.
D
Distractor review
Use Cloud Functions triggered by GCS events to read and transform the 5 GB file directly.
Cloud Functions have a 9-minute timeout (gen1) or 60 minutes (gen2), and 8 GB memory max. Processing a 5 GB file in a single function is risky and doesn't handle transformation at scale.
Common exam trap
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.
Technical deep dive
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.
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
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
A compliance archive stores legal documents accessed at most once per quarter. Which Cloud Storage class minimizes storage cost while meeting that access pattern?
Question 3
Which gcloud command creates a Compute Engine VM named 'web-01' using the e2-medium machine type in zone us-central1-a?
Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Configure a Cloud Storage Pub/Sub notification → Cloud Function that launches a Dataflow job for each new file. — Cloud Storage can send notifications to Pub/Sub when new objects are created. A Pub/Sub push subscription can trigger a Cloud Run job (or Cloud Functions for smaller files). However, for files up to 5 GB and a 10-minute processing budget, Dataflow (triggered via the Dataflow REST API or via an event-driven Cloud Workflow) is more appropriate. Alternatively, an event-driven Dataflow job triggered by Cloud Scheduler or Pub/Sub + Cloud Functions → Dataflow launch handles large files within the time budget.
What should I do if I get this ACE 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 ACE NAT questions on configuration and troubleshooting.
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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.