Rick Graziani has been an instructor of computer networking and computer science courses at Cabrillo College in Aptos, California since 1994. Rick also teaches networking courses in the Computer Engineering department at the University of California, Santa Cruz and is on the Curriculum Engineering team for Cisco Networking Academy. Prior to teaching, he worked in the information technology field for Santa Cruz Operation, Tandem Computers, Lockheed Missiles and Space Company, and served five years in the U.S. Coast Guard. When he is not working, he is most likely surfing at one of his favorite Santa Cruz surf breaks or hanging out with his dog, Luigi. You are welcome to use his instructional resources on his Cabrillo College website, www.cabrillo.edu/~rgraziani, for IPv6, CCNA, or CCNP information. You can email email@example.com to obtain the username and password for all his materials.