The figure above shows two types of subnets:

• Subnets with /16, which means that the subnet mask can be written as 255.255.0.0. This subnet can have around 65 thousand hosts.
• Subnets with /24, which indicates that the subnet mask can be expressed as 255.255.255.0. This subnet can have around 250 hosts.

• Using ARP Requests
• Using ICMP Packets
• Using TCP SYN Scan
• Summary 1.0

• Fine Tuning Scope and Performance
• Summary 2.0

• TCP NULL, FIN and XMAS Scan
• TCP ACK, WINDOW and CUSTOM Scan

• Spoofing and Decoys
• Fragmented Packets
• Idle/Zombie Scan
• Summary 3.0