After footprinting and reconnaissance, scanning is the second phase of information gathering that hackers use to size up a network. Network scans are a key tool in the arsenal of ethical hackers, who work to prevent attacks on an organizations infrastructure and data. This course investigates the scanning tools and techniques used to obtain information from a target system. Instructor Lisa Bock discusses the importance of scanning the network during an Ethical Hacking exercise. She covers host discovery methods and explains ways to identify open services and determine the OS on a host. In addition, Lisa outlines evasion techniques to use when scanning and presents anti-spoofing and scanning methods Note: The Ethical Hacking series maps to the 20 parts of the EC-Council Certified Ethical Hacker (CEH) exam (312_50) version 12.