Stephen Dugan is currently an independent contract instructor and network engineer. He has been teaching Cisco networking for the last 3 years focusing on Router and Switch configuration, Voice/Data integration, and Network Security. His students come mostly from Fortune 500 companies and large service providers. He also teaches private internal classes to Cisco Employees. As a Sr. Network Engineer he has worked on the design and implementation of large enterprise, government contractor, and service provider networks. He is also working on a new series of security books entitled "Hacker Attacktecs." The first three planned books will cover Windows, Unix/Linux, and Cisco exploits and how to defend against them.