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Which combination best represents passive DNS enumeration techniques (no direct queries to target authoritative servers)?

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Which combination best represents passive DNS enumeration techniques (no direct queries to target authoritative servers)?

Certificate Transparency logs + public WHOIS + passive DNS databases

AXFR + zone transfer testing

TCP SYN scan + banner grabbing

Direct dig queries to authoritative NS records + brute-force subdomains

This question is part of this quiz :

Cyber Quiz Day 30
Tags:
Ethical Hacking
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