- A
Use `gsutil -m cp` from a Compute Engine VM in the same region as the destination bucket.
Why wrong: gsutil can transfer data but requires manual setup and management. For 50 TB from a different cloud provider (S3), Storage Transfer Service provides managed transfer with retry, scheduling, and monitoring.
- B
Use Storage Transfer Service to set up an S3-to-GCS transfer job.
Storage Transfer Service natively supports AWS S3 as a source. It manages parallelism, retries, filtering, and scheduling for large cross-cloud transfers — purpose-built for this use case.
- C
Download from S3 and re-upload to GCS using a local machine with high bandwidth.
Why wrong: Using a local machine introduces latency through the local network and requires significant operational management. Storage Transfer Service uses Google's network infrastructure for efficiency.
- D
Use BigQuery Data Transfer Service to move S3 data to GCS.
Why wrong: BigQuery Data Transfer Service transfers data into BigQuery, not into Cloud Storage. It's not designed for direct S3-to-GCS transfers.
Quick Answer
The answer is Storage Transfer Service, which is the correct choice because it is a fully managed service designed to efficiently transfer large data from AWS S3 to cloud storage without requiring any intermediate compute resources. It handles the 50 TB transfer within the 48-hour window by automatically parallelizing connections to maximize throughput over the 1 Gbps link, overcoming the theoretical limit of roughly 5.4 TB per day through retries and optimized concurrency. On the Google Associate Cloud Engineer exam, this question tests your understanding of managed data migration services versus manual approaches—a common trap is choosing to spin up a Compute Engine VM with gsutil, which would require significant tuning and risk failing under the time constraint. Remember the key distinction: Storage Transfer Service is asynchronous and purpose-built for cross-cloud bulk transfers, while gsutil is better for smaller, ad-hoc jobs. Memory tip: think “STS for S3 to GCS” — the acronym itself points to the correct service.
Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of a cloud solution. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 need to transfer 50 TB of data from an AWS S3 bucket to Cloud Storage. The data must be transferred within 48 hours, and the network bandwidth between AWS and GCP is limited to 1 Gbps. Which GCP service manages this transfer efficiently?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use Storage Transfer Service to set up an S3-to-GCS transfer job.
Storage Transfer Service is the correct choice because it is a managed service designed specifically for moving large datasets from external cloud providers (like AWS S3) to Google Cloud Storage. It handles the transfer asynchronously, can parallelize connections to maximize throughput, and is ideal for the 50 TB / 48-hour constraint given a 1 Gbps link (theoretical max ~5.4 TB/day, but with parallelism and retries, STS can approach line rate). It eliminates the need for an intermediate VM or manual scripting.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 `gsutil -m cp` from a Compute Engine VM in the same region as the destination bucket.
Why it's wrong here
gsutil can transfer data but requires manual setup and management. For 50 TB from a different cloud provider (S3), Storage Transfer Service provides managed transfer with retry, scheduling, and monitoring.
- ✓
Use Storage Transfer Service to set up an S3-to-GCS transfer job.
Why this is correct
Storage Transfer Service natively supports AWS S3 as a source. It manages parallelism, retries, filtering, and scheduling for large cross-cloud transfers — purpose-built for this use case.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Download from S3 and re-upload to GCS using a local machine with high bandwidth.
Why it's wrong here
Using a local machine introduces latency through the local network and requires significant operational management. Storage Transfer Service uses Google's network infrastructure for efficiency.
- ✗
Use BigQuery Data Transfer Service to move S3 data to GCS.
Why it's wrong here
BigQuery Data Transfer Service transfers data into BigQuery, not into Cloud Storage. It's not designed for direct S3-to-GCS transfers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a Compute Engine VM with `gsutil -m cp` is the simplest approach, but they overlook that Storage Transfer Service is a fully managed, scalable solution that offloads orchestration and retry logic, making it the only viable option for meeting a strict time constraint with limited bandwidth.
Detailed technical explanation
How to think about this question
Storage Transfer Service uses a distributed agent architecture that can open multiple concurrent TCP connections to the S3 source, effectively saturating the 1 Gbps link even with high latency between regions. It also supports incremental syncs, object metadata preservation, and automatic retries for transient failures. In practice, for a 50 TB transfer, STS can complete within 24–36 hours if the source bucket is in a region with good peering to GCP (e.g., us-east-1 to us-central1).
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.
TExam Day Tips
- 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.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ACE question test?
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Storage Transfer Service to set up an S3-to-GCS transfer job. — Storage Transfer Service is the correct choice because it is a managed service designed specifically for moving large datasets from external cloud providers (like AWS S3) to Google Cloud Storage. It handles the transfer asynchronously, can parallelize connections to maximize throughput, and is ideal for the 50 TB / 48-hour constraint given a 1 Gbps link (theoretical max ~5.4 TB/day, but with parallelism and retries, STS can approach line rate). It eliminates the need for an intermediate VM or manual scripting.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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.
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