CAS-004 Security Operations Practice Question
A security analyst is conducting a penetration test for a client. The rules of engagement specify that no social engineering is allowed. Which TWO of the following reconnaissance techniques are permitted under these rules?
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
✓
Scanning the client's external network for open ports
Passive reconnaissance (OSINT) does not interact with the target and is allowed. Active reconnaissance without social engineering is also typically allowed if specified. Social engineering involves human interaction, which is prohibited.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Calling the help desk to obtain credentials
Why it's wrong here
Calling is social engineering.
- ✓
Scanning the client's external network for open ports
Why this is correct
Port scanning is active recon but does not involve social engineering.
- ✓
Performing DNS enumeration using public records
Why this is correct
DNS enumeration via public records is passive OSINT.
- ✗
Sending phishing emails to employees
Why it's wrong here
Phishing is social engineering.
- ✗
Tailgating into the building
Why it's wrong here
Tailgating is physical social engineering.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 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-005 exam.