Quick Answer
The correct endpoint to use after migrating an on-premises MySQL database to Amazon RDS for MySQL is the RDS instance endpoint, which is a DNS name. This is the right choice because the RDS instance endpoint resolves to the primary node of a single DB instance, allowing the application to connect using the same MySQL protocol and connection logic it used on-premises—only the hostname changes, minimizing application disruption. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of RDS connectivity options versus other endpoints like the reader endpoint (for read replicas) or the cluster endpoint (for Aurora). A common trap is confusing the RDS instance endpoint with the Multi-AZ failover behavior—remember that the instance endpoint automatically points to the primary even after failover, so no application changes are needed. Memory tip: think of the instance endpoint as the “single source of truth” for a standard RDS migration—just swap the old hostname for this DNS name, and you’re done.
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.
A company is migrating an on-premises MySQL database to Amazon RDS for MySQL. The company wants to minimize application changes. Which endpoint type should the application use after migration?
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.
RDS reader endpoint
Why wrong: Reader endpoint is for read replicas.
RDS cluster endpoint
Why wrong: Cluster endpoint is for Aurora, not RDS MySQL.
RDS instance endpoint (DNS name)
Application connects to the RDS instance endpoint.
RDS console endpoint
Why wrong: Console is for management, not database connections.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
RDS instance endpoint (DNS name)
Option C is correct because the RDS instance endpoint (DNS name) is the standard connection endpoint for a single RDS DB instance, which is the target of a direct migration from on-premises MySQL to Amazon RDS for MySQL. This endpoint requires no application changes, as the application simply replaces the old on-premises hostname with the RDS instance DNS name, maintaining the same MySQL protocol and connection logic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
RDS reader endpoint
Why it's wrong here
Reader endpoint is for read replicas.
RDS cluster endpoint
Why it's wrong here
Cluster endpoint is for Aurora, not RDS MySQL.
RDS instance endpoint (DNS name)
Why this is correct
Application connects to the RDS instance endpoint.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
RDS console endpoint
Why it's wrong here
Console is for management, not database connections.
Common exam traps
The trap here is that candidates confuse RDS instance endpoints with Aurora cluster endpoints, mistakenly selecting the cluster endpoint (Option B) for a standard RDS MySQL migration, even though cluster endpoints are exclusive to Aurora and not applicable to single-instance RDS deployments.
Detailed technical explanation
The RDS instance endpoint is a DNS name that resolves to the underlying EC2 instance or network interface hosting the RDS DB instance, and it remains stable even if the underlying infrastructure changes due to failover or maintenance. During migration, the application's JDBC or MySQL client connection string is updated to point to this endpoint, which supports the same MySQL wire protocol (port 3306) and authentication mechanisms as the on-premises database, ensuring zero code changes. In a real-world scenario, if the company later decides to use Multi-AZ for high availability, the instance endpoint automatically points to the primary instance after failover, maintaining application connectivity without additional configuration.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment and Migration — study guide chapter
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
The correct answer is: RDS instance endpoint (DNS name) — Option C is correct because the RDS instance endpoint (DNS name) is the standard connection endpoint for a single RDS DB instance, which is the target of a direct migration from on-premises MySQL to Amazon RDS for MySQL. This endpoint requires no application changes, as the application simply replaces the old on-premises hostname with the RDS instance DNS name, maintaining the same MySQL protocol and connection logic.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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