Quick Answer
The correct connection string is mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 3306 -u admin -p, because the RDS MySQL endpoint and default port 3306 are the only valid combination for connecting from an EC2 instance within the same VPC. The RDS endpoint, shown in the exhibit as a fully qualified domain name, resolves to a private IP within the VPC, ensuring low-latency traffic without traversing the internet, while port 3306 is the standard MySQL listener. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your ability to read the RDS console output and avoid common traps like confusing the port for Aurora (3307) or using a public DNS name when the instance is in the same VPC. A frequent mistake is selecting a string with the wrong port or an incorrect address, such as a cluster endpoint for a single instance. Remember: for a standard RDS MySQL instance, the endpoint is always the writer endpoint, and the port is always 3306—think “MySQL means 3306” to lock it in.
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.
Refer to the exhibit. You run the command and get the output shown. The database is an RDS for MySQL instance. You need to connect to it from an EC2 instance in the same VPC. Which connection string should be used?
mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 3306 -u admin -p
Correct endpoint and port.
psql -h mydb.123456789012.us-east-1.rds.amazonaws.com -p 5432 -U admin
Why wrong: psql is for PostgreSQL.
mysql -h mydb.us-east-1.rds.amazonaws.com -P 3306 -u admin -p
Why wrong: Incorrect endpoint.
mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 5432 -u admin -p
Why wrong: Port 5432 is for PostgreSQL.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 3306 -u admin -p
Option C is correct because the endpoint address and port are shown. Option A is wrong because it uses the wrong port. Option B is wrong because it uses the wrong address. Option D is wrong because it uses the wrong engine.
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.
mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 3306 -u admin -p
Why this is correct
Correct endpoint and port.
Related concept
Read the scenario before looking for a memorised answer.
psql -h mydb.123456789012.us-east-1.rds.amazonaws.com -p 5432 -U admin
Why it's wrong here
psql is for PostgreSQL.
mysql -h mydb.us-east-1.rds.amazonaws.com -P 3306 -u admin -p
Why it's wrong here
Incorrect endpoint.
mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 5432 -u admin -p
Why it's wrong here
Port 5432 is for PostgreSQL.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: mysql -h mydb.123456789012.us-east-1.rds.amazonaws.com -P 3306 -u admin -p — Option C is correct because the endpoint address and port are shown. Option A is wrong because it uses the wrong port. Option B is wrong because it uses the wrong address. Option D is wrong because it uses the wrong engine.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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