The correct answer is dependency scanning and static application security testing (SAST), as these two practices are essential for integrating security into the development process within a secure SDLC (SSDLC). Dependency scanning checks for known vulnerabilities in third-party libraries and open-source components, which are common attack vectors, while SAST analyzes source code without execution to catch flaws like SQL injection or buffer overflows early in the coding phase. On the CompTIA SecurityX CAS-004 exam, this question tests your understanding of how to embed security controls into development workflows, often contrasting SAST with DAST (dynamic testing) or confusing dependency scanning with software composition analysis—remember that dependency scanning specifically targets library vulnerabilities, not code logic. A common trap is selecting penetration testing, which occurs later in the lifecycle, rather than these proactive, shift-left practices. Memory tip: “Scan code and scan deps—catch flaws before they step.”
CAS-004 SSDLC essential practices Practice Question
This CAS-004 practice question tests your understanding of application environment, configuration and security. 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 security architect is designing a secure software development lifecycle (SSDLC). Which of the following practices are essential for integrating security into the development process? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Conducting static application security testing (SAST) during coding
Static application security testing (SAST) analyzes source code, bytecode, or binaries without executing the program, allowing developers to identify vulnerabilities such as buffer overflows, SQL injection, and cross-site scripting during the coding phase. Integrating SAST early in the SSDLC reduces the cost and effort of fixing security flaws by catching them before they reach later stages like testing or production.
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.
✗
Performing penetration testing only after production deployment
Why it's wrong here
Pen testing is important but occurs later; it's not integrated into the development process early.
✗
Implementing runtime application self-protection (RASP) in development
Why it's wrong here
RASP is a runtime control, not typically integrated into the development phase.
✗
Deploying a web application firewall (WAF) in staging
Why it's wrong here
WAF is a network security control, not a development practice.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CAS-004 exam frequently reuses these exact scenarios with slightly different constraints.
✓Conducting static application security testing (SAST) during codingCorrect answer▾✗Performing penetration testing only after production deploymentWrong answer — click to see why▾
Why this is wrong here
Pen testing is important but occurs later; it's not integrated into the development process early.
✗Implementing runtime application self-protection (RASP) in developmentWrong answer — click to see why▾
Why this is wrong here
RASP is a runtime control, not typically integrated into the development phase.
✗Deploying a web application firewall (WAF) in stagingWrong answer — click to see why▾
Why this is wrong here
WAF is a network security control, not a development practice.
Analysis generated from the official CAS-004blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between security controls applied during development (SAST, dependency scanning) versus runtime controls (RASP, WAF) or post-deployment activities (penetration testing), leading candidates to select options that are valid security measures but not essential to the SSDLC itself.
Detailed technical explanation
How to think about this question
SAST tools parse source code into an abstract syntax tree (AST) and apply pattern matching or data flow analysis to detect vulnerabilities like CWE-89 (SQL injection) by tracing tainted input from entry points to sinks. Dependency scanning, often implemented via tools like OWASP Dependency-Check or Snyk, cross-references library versions against the National Vulnerability Database (NVD) using CVE identifiers to flag known vulnerabilities, which is critical because modern applications often rely on dozens of third-party components with their own security histories.
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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Conducting static application security testing (SAST) during coding — Static application security testing (SAST) analyzes source code, bytecode, or binaries without executing the program, allowing developers to identify vulnerabilities such as buffer overflows, SQL injection, and cross-site scripting during the coding phase. Integrating SAST early in the SSDLC reduces the cost and effort of fixing security flaws by catching them before they reach later stages like testing or production.
What should I do if I get this CAS-004 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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