DBS-C01 Deployment and Migration Practice Question
A company is migrating a 500 GB Oracle database to Amazon RDS for Oracle. They want to minimize downtime and use AWS DMS for ongoing replication. The source database is in a corporate data center behind a firewall. What is the recommended network setup for the DMS replication instance?
⚠ Common exam trap
It's easy for candidates to assume DMS can use a public IP address or VPC endpoints for source connectivity, but DMS replication instances require direct network layer connectivity (Layer 3) to the source, which is only achieved via VPN or Direct Connect for on-premises sources.
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
✓
Deploy the DMS replication instance in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center.
AWS DMS requires network connectivity between the replication instance and both the source and target databases. Since the source Oracle database is behind a corporate firewall, the DMS replication instance must be deployed in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center. This establishes a private, secure, and low-latency network path for ongoing replication, minimizing downtime during migration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy the DMS replication instance in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center.
Why this is correct
This provides a private network path for DMS to access the source database.
- ✗
Launch the DMS replication instance with a public IP address and allow inbound traffic from the corporate firewall.
Why it's wrong here
DMS replication instances should not be exposed to the internet; a VPN/Direct Connect is more secure and reliable.
- ✗
Create a VPC endpoint for the DMS service and route traffic through it.
Why it's wrong here
VPC endpoints are for accessing AWS services privately, not for connecting to on-premises databases.
- ✗
Install the DMS replication software on a server in the corporate data center to connect directly to the source.
Why it's wrong here
DMS is a managed service; the replication instance runs in AWS, not on-premises.
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