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I can't believe that is the B, but the documentation say "for HDFS data"
The Oracle Data Transfer Appliance is another option for data t ransfer when moving data over the wire is not feasible.
Bandwidth or resource constraints might exist on the source cluster, or proximity to an Oracle Cloud Infrastructure region might limit FastConnect availability. The data set could also be so large that it would take too long to copy. In these cases, Oracle can send you a Data Transfer Appliance that you can deploy in your data center and use as a DistCp target for HDFS data.
https://docs.oracle.com/en/solutions/learn-migrate-app-data-to-cloud/data-migration-options.html#GUID-6AFE04A7-721F-46BD-AD05-AEBEAA93AF0F
Communicate to on-prem: Dynamic routing gateway(virtual router that provides path for private traffic betn VCN & destination other than the internet). To establish it use: IPSec VPN Or FastConnect
B. is correct, Oracle Cloud Infrastructure Data Transfer Appliance securely moves terabytes or petabytes data between on-premise data centers and the cloud. The service reduces data migration times from weeks or months to just hours and is available for data import to the cloud and data export from the cloud
B is correct. DRG is a secure broadband connection between customer premises and OCI. However the question is related to bulk data migration, for which DTA service can be availed. This however is not covered or even mentioned in the Foundations course lectures.
C is the correct answer, why? DRG or Fast connect is recommended to transfer high number of data (not size) while Data Transfer appliance is recommended for Big data (huge size)
C seems right, but looking at OCI literature, B seems where they want to go right away. https://docs.oracle.com/en/solutions/learn-migrate-app-data-to-cloud/data-migration-options.html#GUID-BB44605C-79A9-496A-BC50-16B4FB7BCDD9
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