The answer is to add a command that installs the security scanning tool in the pre_build or build phase of the buildspec.yml file. This works because CodeBuild executes shell commands sequentially within defined phases, and any command that returns a non-zero exit code will immediately halt the build and mark it as failed. By relying on the security scanner’s default exit behavior—or explicitly checking its exit code—you create an automated security gate that stops the pipeline when vulnerabilities are detected, without needing complex custom scripting. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of CodeBuild lifecycle phases and how to enforce quality gates using native exit code handling. A common trap is assuming you need a separate post-build validation step or a custom script to parse output; in reality, the tool’s own exit code is sufficient. Remember the mnemonic: “Exit code gates the build—no custom scripts required.”
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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.
A company uses AWS CodeBuild to build and test a Node.js application. The buildspec.yml currently runs npm install and npm test. They want to also run a security scan using a third-party tool. Which THREE steps are required to integrate the security scan into the CodeBuild build?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure the build fails if the scanner finds vulnerabilities by checking the exit code.
Option A is correct because CodeBuild phases (install, pre_build, build, post_build) run shell commands sequentially, and a non-zero exit code from any command causes the build to fail. By checking the exit code of the security scanner (e.g., via `$?` or relying on the tool's default exit behavior), the build will stop and report failure if vulnerabilities are found, enforcing a security gate. This is the standard mechanism to integrate third-party tools without custom scripting.
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.
✓
Ensure the build fails if the scanner finds vulnerabilities by checking the exit code.
Why this is correct
Fail the build on security issues.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new 'security' phase in the buildspec.yml.
Why it's wrong here
CodeBuild does not have a 'security' phase; use existing phases.
✓
Add a command to run the security scanner in the build phase.
Why this is correct
Run the scanner during the build.
Related concept
Read the scenario before looking for a memorised answer.
✓
Add a command to install the security scanning tool in the pre_build or build phase.
Why this is correct
The tool must be installed before running.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upload the security scanner configuration to an S3 bucket and reference it in the buildspec.
Why it's wrong here
Configuration can be included in the buildspec or fetched, but not a required step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates think they need to create a custom phase (Option B) to run a security scan, but CodeBuild's fixed phases are sufficient—simply add the scanner command to the existing build phase after the test step.
Detailed technical explanation
How to think about this question
Under the hood, CodeBuild executes each phase in a separate shell session, and the exit code of the last command in a phase determines the phase's success. For security scanners like Snyk or Trivy, they return exit code 1 (or higher) when vulnerabilities exceed a threshold. By placing the scanner command in the build phase (after npm install), you ensure dependencies are available for scanning. The scanner must be installed earlier (e.g., in pre_build via npm install -g snyk or curl) so it's present when invoked—this is why both installing the tool (D) and running it (C) are required, alongside exit code handling (A).
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 — 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 build fails if the scanner finds vulnerabilities by checking the exit code. — Option A is correct because CodeBuild phases (install, pre_build, build, post_build) run shell commands sequentially, and a non-zero exit code from any command causes the build to fail. By checking the exit code of the security scanner (e.g., via `$?` or relying on the tool's default exit behavior), the build will stop and report failure if vulnerabilities are found, enforcing a security gate. This is the standard mechanism to integrate third-party tools without custom scripting.
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.
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Question Discussion
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