- A
Establish VPC peering or VPN between the source and target VPCs, and configure security group rules.
DMS requires network connectivity between the replication instance and the source database.
- B
Assign an IAM role to the source database to allow DMS access.
Why wrong: IAM roles are for AWS service permissions, not for database authentication.
- C
Configure an S3 VPC gateway endpoint for the source VPC.
Why wrong: S3 endpoints are for S3 access, not for database connectivity.
- D
Create a VPC endpoint for DMS in the source account.
Why wrong: VPC endpoints are for accessing AWS services, not for DMS connectivity to a database.
Question 1,606 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating a 100 GB Oracle database to Amazon RDS for Oracle. They want to use AWS DMS. The source database is in a different AWS account. What is required to allow DMS to connect to the source?
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
✓
Establish VPC peering or VPN between the source and target VPCs, and configure security group rules.
AWS DMS requires network connectivity between the replication instance and the source database. Since the source is in a different AWS account, VPC peering or a VPN connection must be established to route traffic between the VPCs. Additionally, security group rules in both VPCs must allow inbound/outbound traffic on the Oracle listener port (default 1521) from the DMS replication instance's IP or security group.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Establish VPC peering or VPN between the source and target VPCs, and configure security group rules.
Why this is correct
DMS requires network connectivity between the replication instance and the source database.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Assign an IAM role to the source database to allow DMS access.
Why it's wrong here
IAM roles are for AWS service permissions, not for database authentication.
- ✗
Configure an S3 VPC gateway endpoint for the source VPC.
Why it's wrong here
S3 endpoints are for S3 access, not for database connectivity.
- ✗
Create a VPC endpoint for DMS in the source account.
Why it's wrong here
VPC endpoints are for accessing AWS services, not for DMS connectivity to a database.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse IAM roles (which handle authorization for AWS services) with network connectivity requirements, assuming a role can grant DMS access to a database in another account, when in fact DMS needs direct network layer access via VPC peering or VPN.
Detailed technical explanation
How to think about this question
VPC peering uses the AWS global network to route traffic between VPCs with no single point of failure or bandwidth bottleneck, but it does not support transitive routing—each peering connection must be explicitly established. For cross-account DMS migrations, the DMS replication instance must be in the target account's VPC, and the source VPC's route tables must have a route pointing to the peering connection (or VPN) for the target VPC CIDR. Security group rules must reference the private IP of the DMS replication instance or its security group ID (if cross-account security group referencing is enabled).
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Establish VPC peering or VPN between the source and target VPCs, and configure security group rules. — AWS DMS requires network connectivity between the replication instance and the source database. Since the source is in a different AWS account, VPC peering or a VPN connection must be established to route traffic between the VPCs. Additionally, security group rules in both VPCs must allow inbound/outbound traffic on the Oracle listener port (default 1521) from the DMS replication instance's IP or security group.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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