PDE Ingesting and Processing the Data Practice Question
A data engineer needs to transfer 500 TB of on-premises data to Google Cloud Storage. The data is stored on NAS devices and the network bandwidth is limited to 100 Mbps. What is the most cost-effective and timely transfer method?
⚠ Common exam trap
The trap is underestimating transfer time — candidates pick Storage Transfer Service or gsutil because they are 'cloud-native,' forgetting that 500 TB over 100 Mbps is physically impossible in a reasonable timeframe.
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 Transfer Appliance
Transfer Appliance is Google's physical data transfer service that ships a rackable appliance to the customer site, where data is copied locally and the appliance is shipped back to Google for upload to Cloud Storage. For 500 TB over a 100 Mbps link, the network transfer time would be roughly 1.5 years, making online transfer impractical. Transfer Appliance is the most cost-effective and timely option for this volume and bandwidth.
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 Storage Transfer Service over the internet
Why it's wrong here
Storage Transfer Service over the internet is bound by the same 100 Mbps uplink, requiring roughly 500 days for 500 TB. It is tempting because it is the managed, agentless route for online transfers between sources and Cloud Storage. When bandwidth is this constrained, Transfer Appliance is the appropriate mechanism.
- ✗
Use a VPN connection and rsync
Why it's wrong here
A VPN plus rsync still traverses the same 100 Mbps link, so 500 TB would take over a year regardless of rsync's delta efficiency. It is tempting because rsync is the standard tool for incremental NAS synchronisation over a network. Offline shipping via Transfer Appliance bypasses the bandwidth constraint entirely.
- ✗
Use gsutil cp in parallel
Why it's wrong here
At 100 Mbps, 500 TB takes roughly 500 days, so parallel gsutil streams cannot overcome the link itself. It is tempting because gsutil parallel composite uploads genuinely accelerate transfers when bandwidth is adequate. For NAS data at this volume, a physical appliance such as Transfer Appliance is the timely, cost-effective route.
- ✓
Use Transfer Appliance
Why this is correct
Transfer Appliance bypasses the 100 Mbps network constraint entirely by shipping physical hardware, making 500 TB feasible in days rather than the months a 100 Mbps link would require. For NAS-resident data at this volume, it is also more cost-effective than sustained egress or Interconnect charges.
Visual reference
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Google Cloud exam blueprint
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.