The answer is spear-phishing, exploitation of public-facing applications, and valid accounts. These three are correct because the MITRE ATT&CK framework identifies them as primary initial access techniques, where an adversary gains a foothold by tricking a user, exploiting a software vulnerability exposed to the internet, or leveraging legitimate credentials to bypass perimeter defenses. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to map ATT&CK tactics to specific techniques, often appearing in scenario-based items where you must distinguish initial access from lateral movement or persistence. A common trap is confusing valid accounts with persistence, but remember that initial access focuses on the very first entry, not maintaining it. For a quick memory tip, think of the three “E”s: Email (spear-phishing), Exploit (public-facing apps), and Entry (valid accounts).
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 CSIRT is developing a threat hunting hypothesis based on the MITRE ATT&CK framework. Which THREE of the following are techniques that threat hunters would commonly investigate for initial access? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Exploit public-facing application
Options A, B, and D are correct. Spear-phishing, exploitation of public-facing applications, and valid accounts are common initial access techniques. Option C is for lateral movement, and Option E is for persistence.
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.
✓
Exploit public-facing application
Why this is correct
Exploiting vulnerabilities in internet-facing applications is another common technique.
Related concept
Read the scenario before looking for a memorised answer.
✓
Spear-phishing attachment
Why this is correct
Spear-phishing is a common initial access vector.
Related concept
Read the scenario before looking for a memorised answer.
✓
Valid accounts
Why this is correct
Using valid credentials to gain initial access is a common technique.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remote services
Why it's wrong here
Remote services are often used for lateral movement, not initial access.
✗
Boot or logon autostart execution
Why it's wrong here
This is a persistence technique, not initial access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CAS-004 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.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Exploit public-facing application — Options A, B, and D are correct. Spear-phishing, exploitation of public-facing applications, and valid accounts are common initial access techniques. Option C is for lateral movement, and Option E is for persistence.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
Question Discussion
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