Todd Lammle, CCSI, CCNA, CCNP, CCSP, CCVP, MCSE, CEH, CHFI, FCC RF Licensed, is a leading authority on Cisco networking. He is President of GlobalNet Training, Inc, a networking integration andtraining firm based in Dallas, and CEO of RouterSim, LLC. Todd is the bestselling author of numerous Cisco books, including the popular CCNA: Cisco Certified Network Associate Study Guide, with over 200,000 copies in print. He can be reached at www.lammle.com.