PDE Ingesting and Processing the Data Practice Question
A data engineer needs to transfer 500 TB of archival data from an on-premises NAS to Cloud Storage. The on-premises network has limited bandwidth (100 Mbps). Which transfer method should they recommend?
⚠ Common exam trap
The exam often tests the misconception that any cloud-native tool (like Storage Transfer Service or gsutil) can handle large data volumes regardless of bandwidth, ignoring the physical reality of network transfer times for archival-scale data.
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
✓
Transfer Appliance
The Transfer Appliance is a physical device designed for large-scale data transfers (up to petabytes) when network bandwidth is insufficient. With 500 TB of data and only 100 Mbps bandwidth, the theoretical transfer time would be over 500 days, making any online transfer method impractical. The Transfer Appliance bypasses network constraints entirely by shipping the data physically to Google Cloud.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Storage Transfer Service for on-premises
Why it's wrong here
Storage Transfer Service for on-premises requires a self-hosted transfer agent and is designed for recurring or scheduled transfers of moderate datasets, not a one-off 500 TB bulk migration. At 100 Mbps, transferring 500 TB would take months, so a physical appliance such as Transfer Appliance is required. It is tempting because it is the native on-premises-to-Cloud-Storage service.
- ✗
gsutil rsync
Why it's wrong here
gsutil rsync still pushes all 500 TB across the same 100 Mbps link, so the transfer would take months and likely time out. It is tempting because rsync efficiently synchronises changed files between locations, which suits incremental refreshes over adequate bandwidth, not a one-off bulk migration.
- ✓
Transfer Appliance
Why this is correct
At 100 Mbps, transferring 500 TB over the network would take months, far exceeding any practical window. Transfer Appliance ships physical storage to Google, sidestepping the bandwidth constraint entirely, whereas online methods remain bottlenecked by the same limited link.
- ✗
Dataflow pipeline reading from NAS
Why it's wrong here
Dataflow reads from the NAS and writes to Cloud Storage over the same constrained 100 Mbps link, so the 500 TB still traverses the bottleneck. It is tempting because Dataflow excels at transforming and moving data between sources and sinks, which fits streaming or ETL workloads, not bulk offline seeding.
Go deeper
Related to this question
About these practice questions
This PDE question is part of Courseiva's 747-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PDE 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 PDE exam.