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Cyber Security Academy · Lesson

Nmap Port Scanning Techniques

Run SYN, TCP connect, UDP, and version scans; read Nmap output; tune timing and avoid detection.

Why Port Scanning Matters

Port scanning reveals which services are running on a target. Every open port is a potential entry point — knowing what is exposed is the first step in both offense and defense.

TCP SYN Scan (Stealth Scan)

The SYN scan (-sS) sends a SYN packet and waits for SYN-ACK without completing the handshake. It is fast, less likely to be logged, and requires root privileges.

# SYN scan (requires root)
sudo nmap -sS 192.168.1.0/24

# Results: open / closed / filtered

All lessons in this course

  1. Nmap Port Scanning Techniques
  2. Service and OS Fingerprinting
  3. Netcat: The Swiss Army Knife
  4. Network Enumeration Scripting
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