Define Nmap Stealth (half-open or syn) Scan
Initiates TCP 3-way handshake without sending final acknowledgement message
Nmap Stealth Scan Command
(default scan) nmap [ip/hostname]
(explicit) nmap -sS [ip/hostname]
Nmap Stealth Scan Cons
Could be picked up by alert systems
Requires root privileges
Nmap Stealth Scan Pros
Faster
Quieter