DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Network Topology
Refer to the exhibit. A company is migrating from an on-premises MySQL database to Amazon RDS for MySQL. The DBA wants to connect to the RDS instance using the endpoint shown. What additional step is required to allow the DBA's client to connect?
Network Topology
A
Modify the security group to allow inbound traffic on port 3306 from the client IP
Security group rules control inbound traffic; port 3306 must be open.
B
Create a Route 53 record for the endpoint
Why wrong: The endpoint DNS is already provided; no additional Route 53 record is needed.
C
Create a MySQL user that matches the client's IP
Why wrong: A MySQL user is needed, but that is part of setup, not the connection issue.
D
Change the RDS instance to be publicly accessible
Why wrong: The instance may already be public; the endpoint is shown, but security group still needs to allow access.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the security group to allow inbound traffic on port 3306 from the client IP
Amazon RDS security groups act as a virtual firewall controlling inbound and outbound traffic. By default, no inbound traffic is allowed on port 3306 (MySQL). To permit the DBA's client to connect, you must modify the security group associated with the RDS instance to add an inbound rule that allows TCP traffic on port 3306 from the client's IP address (or a range that includes it). Without this rule, the connection is blocked at the network level regardless of other configurations.
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.
✓
Modify the security group to allow inbound traffic on port 3306 from the client IP
Why this is correct
Security group rules control inbound traffic; port 3306 must be open.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a Route 53 record for the endpoint
Why it's wrong here
The endpoint DNS is already provided; no additional Route 53 record is needed.
✗
Create a MySQL user that matches the client's IP
Why it's wrong here
A MySQL user is needed, but that is part of setup, not the connection issue.
✗
Change the RDS instance to be publicly accessible
Why it's wrong here
The instance may already be public; the endpoint is shown, but security group still needs to allow access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The DBS-C01 exam often tests the misconception that making an RDS instance publicly accessible alone is sufficient for connectivity, but the security group rule is the actual gatekeeper; public accessibility only assigns a public IP, while the security group still blocks traffic without an explicit inbound rule.
Trap categories for this question
Command / output trap
The instance may already be public; the endpoint is shown, but security group still needs to allow access.
Detailed technical explanation
How to think about this question
RDS security groups are stateful — if you allow inbound traffic on port 3306, the outbound return traffic is automatically allowed. The security group rule must specify the protocol (TCP), port (3306), and source (the client's IP or a CIDR block). In a real-world migration, the DBA might also need to ensure the RDS instance is in a public subnet with an internet gateway if the client is outside the VPC, but the security group rule is the fundamental step that permits the connection.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Modify the security group to allow inbound traffic on port 3306 from the client IP — Amazon RDS security groups act as a virtual firewall controlling inbound and outbound traffic. By default, no inbound traffic is allowed on port 3306 (MySQL). To permit the DBA's client to connect, you must modify the security group associated with the RDS instance to add an inbound rule that allows TCP traffic on port 3306 from the client's IP address (or a range that includes it). Without this rule, the connection is blocked at the network level regardless of other configurations.
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.
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Question Discussion
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