CAS-004 Security Operations Practice Question
A penetration tester is performing a test against a web application. During active reconnaissance, the tester discovers that the application discloses version numbers in HTTP headers. Which phase of the penetration testing lifecycle does this activity belong to?
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
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Reconnaissance
Active reconnaissance involves directly interacting with the target to gather information, such as by sending probes and analyzing responses. Discovering version numbers via HTTP headers is a form of active reconnaissance because the tester is making requests and inferring information from the responses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Reconnaissance
Why this is correct
Banner grabbing and header inspection gather information about the target's technology stack without exploiting it, which is active reconnaissance within the reconnaissance phase. It precedes scanning, exploitation and post-exploitation, satisfying the lifecycle stage where target intelligence is collected.
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Post-exploitation
Why it's wrong here
Post-exploitation occurs after a vulnerability has been exploited and a foothold established, covering privilege escalation, lateral movement and data exfiltration. Reading version numbers from HTTP response headers requires no access or exploitation, so it belongs to reconnaissance. Post-exploitation would be correct once the tester had already compromised the application and sought to expand access.
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Exploitation
Why it's wrong here
Exploitation is the phase where the tester actually leverages a vulnerability to gain access or execute code. Version disclosure in HTTP headers is information gathering, which belongs to reconnaissance. It is tempting because header leakage can later feed an exploit, but no payload or vulnerability is being triggered here.
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Reporting
Why it's wrong here
Reporting documents findings, risk ratings and remediation advice after testing concludes. It is tempting because reconnaissance produces observations worth recording, but reporting is a distinct final phase; header inspection during active reconnaissance belongs to the reconnaissance phase itself.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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