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DBS-C01 Database Security Practice Question
Arrange the steps to troubleshoot a connection timeout issue from an EC2 instance to an Amazon RDS for SQL Server DB instance in the correct order.
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
✓
First, verify security group inbound rules. Second, check network ACLs. Third, verify EC2 network configuration. Finally, test connectivity using telnet.
Troubleshooting connectivity involves checking security groups, network ACLs, network configuration, and testing with telnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
First, verify security group inbound rules. Second, check network ACLs. Third, verify EC2 network configuration. Finally, test connectivity using telnet.
Why this is correct
This order is correct because it starts with the most common cause (security groups), then proceeds to broader network controls (NACLs), then the EC2's network path, and finally validates with a direct test.
- ✗
First, check network ACLs. Second, verify security group inbound rules. Third, test connectivity using telnet. Finally, verify EC2 network configuration.
Why it's wrong here
This order is incorrect because network ACLs are evaluated after security groups, and testing before verifying network configuration may miss routing issues.
- ✗
First, test connectivity using telnet. Second, verify security group inbound rules. Third, check network ACLs. Finally, verify EC2 network configuration.
Why it's wrong here
This order is incorrect because testing without prior verification of security groups and ACLs may give misleading results and wastes time on troubleshooting without context.
- ✗
First, verify EC2 network configuration. Second, verify security group inbound rules. Third, check network ACLs. Finally, test connectivity using telnet.
Why it's wrong here
This order is incorrect because starting with EC2 network configuration is premature; security groups and NACLs are more common causes and should be checked first.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.