- A
Place the RDS instance in a public subnet with a public IP.
Why wrong: RDS should be in private subnet for security.
- B
Ensure the security group attached to the RDS instance allows inbound traffic from the CodeBuild security group.
Security group rules control traffic to RDS.
- C
Attach a NAT gateway to the VPC so that CodeBuild can route to RDS.
Why wrong: NAT gateway is for outbound internet, not internal traffic.
- D
Ensure the VPC's route tables have routes to allow traffic between CodeBuild subnets and RDS subnets.
Proper routing is required for connectivity.
- E
Configure the CodeBuild project to use a VPC that has access to the RDS instance.
CodeBuild must be in the same VPC to access private resources.
Question 355 of 1,750
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 DevOps team is using AWS CodeBuild to run integration tests against a test database. The database is an Amazon RDS instance in a private subnet. The CodeBuild project is configured to run in a VPC. Which THREE steps are required to allow CodeBuild to access the RDS instance?
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
✓
Ensure the security group attached to the RDS instance allows inbound traffic from the CodeBuild security group.
Option B is correct because the security group attached to the RDS instance must explicitly allow inbound traffic from the security group associated with the CodeBuild project's elastic network interfaces. This is a fundamental network access control in AWS: security groups act as virtual firewalls, and without an inbound rule permitting traffic from the CodeBuild security group on the database port (e.g., 3306 for MySQL), the connection will be blocked regardless of other network 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.
- ✗
Place the RDS instance in a public subnet with a public IP.
Why it's wrong here
RDS should be in private subnet for security.
- ✓
Ensure the security group attached to the RDS instance allows inbound traffic from the CodeBuild security group.
Why this is correct
Security group rules control traffic to RDS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach a NAT gateway to the VPC so that CodeBuild can route to RDS.
- ✓
Ensure the VPC's route tables have routes to allow traffic between CodeBuild subnets and RDS subnets.
Why this is correct
Proper routing is required for connectivity.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the CodeBuild project to use a VPC that has access to the RDS instance.
Why this is correct
CodeBuild must be in the same VPC to access private resources.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for a NAT gateway (which is for internet access) with the requirement for internal VPC routing, or they mistakenly think that placing RDS in a public subnet is necessary for CodeBuild to reach it, when in fact private subnet communication via security groups and route tables is the correct approach.
Detailed technical explanation
How to think about this question
When CodeBuild runs in a VPC, it creates elastic network interfaces (ENIs) in the specified subnets, which are assigned private IPs. The VPC's route tables must have routes that allow traffic between the CodeBuild subnets and the RDS subnets, typically via local routes (which are implicit for subnets within the same VPC). Additionally, the security group on the RDS instance must have an inbound rule referencing the CodeBuild security group (or its CIDR) on the appropriate database port, as security group rules are stateful and evaluated at the instance level.
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.
- →
SDLC Automation — study guide chapter
Learn the concepts, then practise the questions
- →
SDLC Automation practice questions
Targeted practice on this topic area only
- →
All DOP-C02 questions
1,750 questions across all exam domains
- →
AWS Certified DevOps Engineer Professional DOP-C02 study guide
Full concept coverage aligned to exam objectives
- →
DOP-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related DOP-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Configuration Management and IaC practice questions
Practise DOP-C02 questions linked to Configuration Management and IaC.
Resilient Cloud Solutions practice questions
Practise DOP-C02 questions linked to Resilient Cloud Solutions.
Monitoring and Logging practice questions
Practise DOP-C02 questions linked to Monitoring and Logging.
Incident and Event Response practice questions
Practise DOP-C02 questions linked to Incident and Event Response.
Security and Compliance practice questions
Practise DOP-C02 questions linked to Security and Compliance.
SDLC Automation practice questions
Practise DOP-C02 questions linked to SDLC Automation.
DOP-C02 fundamentals practice questions
Practise DOP-C02 questions linked to DOP-C02 fundamentals.
DOP-C02 scenario practice questions
Practise DOP-C02 questions linked to DOP-C02 scenario.
DOP-C02 troubleshooting practice questions
Practise DOP-C02 questions linked to DOP-C02 troubleshooting.
Practice this exam
Start a free DOP-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure the security group attached to the RDS instance allows inbound traffic from the CodeBuild security group. — Option B is correct because the security group attached to the RDS instance must explicitly allow inbound traffic from the security group associated with the CodeBuild project's elastic network interfaces. This is a fundamental network access control in AWS: security groups act as virtual firewalls, and without an inbound rule permitting traffic from the CodeBuild security group on the database port (e.g., 3306 for MySQL), the connection will be blocked regardless of other network configurations.
What should I do if I get this DOP-C02 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More DOP-C02 practice questions
- A company uses AWS CodePipeline with a multi-branch strategy. A new feature branch triggers a pipeline that runs unit te…
- A development team uses AWS CodeBuild to compile a Java application and run unit tests. The build takes 30 minutes, but…
- A company uses AWS CodePipeline with multiple stages: Source (Amazon S3), Build (AWS CodeBuild), and Deploy (AWS CodeDep…
- A company uses AWS CodeCommit for source control. Developers frequently push large binary files (e.g., compiled JARs) to…
- A company runs a Stateful application on EC2 that requires sticky sessions. They use an ALB with duration-based stickine…
- An organization uses AWS CodePipeline to orchestrate deployments to multiple environments (dev, test, prod). Each enviro…
Last reviewed: Jul 4, 2026
This DOP-C02 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 DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.