- A
Deploy the DMS replication instance in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center.
This provides a private network path for DMS to access the source database.
- B
Launch the DMS replication instance with a public IP address and allow inbound traffic from the corporate firewall.
Why wrong: DMS replication instances should not be exposed to the internet; a VPN/Direct Connect is more secure and reliable.
- C
Create a VPC endpoint for the DMS service and route traffic through it.
Why wrong: VPC endpoints are for accessing AWS services privately, not for connecting to on-premises databases.
- D
Install the DMS replication software on a server in the corporate data center to connect directly to the source.
Why wrong: DMS is a managed service; the replication instance runs in AWS, not on-premises.
Quick Answer
The correct answer is to deploy the DMS replication instance in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center. This is required because AWS DMS replication instances must reside within a VPC to function, and they need private, low-latency network connectivity to reach an on-premises source database that sits behind a firewall. Without a VPN or Direct Connect, the replication instance cannot establish a secure, consistent link to the corporate network, as DMS does not support public IP connections for source endpoints. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of hybrid network architectures and the fundamental constraint that DMS instances are always VPC-based. A common trap is assuming DMS can use a VPC endpoint or a public IP for the source, but DMS relies on standard IP routing through a private connection. Memory tip: DMS lives in the VPC, so you must bridge the gap with VPN or Direct Connect.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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.
Option B is correct because DMS replication instances are deployed in a VPC, and to connect to an on-premises database, you need a VPN or Direct Connect for a private connection. Option A is wrong because DMS cannot use a public IP for the source; it needs network connectivity. Option C is wrong because DMS replication instances are not deployed in a corporate data center. Option D is wrong because DMS does not support VPC endpoints for source connectivity; it uses standard IP connectivity.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
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.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Deploy the DMS replication instance in a VPC that has a VPN or AWS Direct Connect connection to the corporate data center. — Option B is correct because DMS replication instances are deployed in a VPC, and to connect to an on-premises database, you need a VPN or Direct Connect for a private connection. Option A is wrong because DMS cannot use a public IP for the source; it needs network connectivity. Option C is wrong because DMS replication instances are not deployed in a corporate data center. Option D is wrong because DMS does not support VPC endpoints for source connectivity; it uses standard IP connectivity.
What should I do if I get this DBS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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