Port Scanning
Port scanning probes services to discover which network ports are reachable and what responses they produce.
Mechanism
A scanner sends connection or probe traffic across a range of ports and observes responses. Defensive detection focuses on scan patterns and context rather than treating every connection attempt as malicious.
Indicators to watch
Many destination ports or hosts from one source, short connection bursts, sequential port patterns, and repeated probes to closed services.
Concept diagram
Defensive controls
Minimize exposed services, use firewalls, segment networks, monitor flow logs, and investigate scans in context.
Recommended security control
Nmap + firewall logs
Only scan systems you own or are explicitly authorized to assess.
Defense tool
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All attack descriptions are for defensive education. Test scanning, traffic generation, interception, wireless testing, and vulnerable applications only on systems and networks you own or are explicitly authorized to assess.