GCP Professional Data Engineer Practice Question

Your company is acquiring a media vendor that stores 800 TB of high-resolution video on an on-premises NAS. All files must be available in a new Cloud Storage bucket within four weeks to feed scheduled Dataflow batch jobs. The vendor's data center has only a 200 Mbps internet connection that cannot be upgraded and must stay available for daily operations. Which ingestion approach best meets the deadline with minimal disruption?

Deploy Storage Transfer Service agents in the data center and run an online transfer job from the NAS to Cloud Storage over the existing link.
Establish a Cloud VPN tunnel and use gsutil −m rsync from an on-premises VM to upload the data to Cloud Storage during off-peak hours.
Create a Dataproc cluster that mounts the NAS and uses distributed copy (DistCp) to transfer the data directly to Cloud Storage across the internet.
Order a Google Cloud Transfer Appliance, copy the 800 TB locally, ship the device to Google, and have the data uploaded into Cloud Storage.

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Answer Description

A sustained 200 Mbps link can move roughly 65 TB in four weeks-far short of the required 800 TB-so any solution that relies on the site's network (such as gsutil, DistCp, or on-premises agents for Storage Transfer Service) will miss the deadline and monopolize the limited bandwidth, impacting daily operations. Google Cloud Transfer Appliance provides a rackable device that the vendor loads onsite at LAN speed, then ships to Google for rapid bulk upload into Cloud Storage. This offline, high-capacity appliance is specifically designed for petabyte-scale migrations when network throughput is insufficient, making it the only option that satisfies both the time constraint and the need to avoid saturating the existing link.

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