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Networking Fundamentals · Intermediate

Nmap

A widely used open-source network scanner for host discovery, port scanning, service detection and OS fingerprinting.

Definition

Common options are -sS (SYN scan), -sU (UDP scan), -sV (service versions), -O (OS detection) and -p (ports).

Example

nmap -sV -p 1-1000 10.1.1.10 identifies services on the first 1000 ports.

Exam tip

Nmap is used both by administrators for audits and by attackers for reconnaissance.

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