Tom Thomas, CCIE No. 9360, CCNP, CCDP, is a certified Cisco Systems instructor. Tom is the founder of NetCerts.com (now CCPrep.com) and the International Network Resource Group (www.inrgi.net) where he is a member of the Board of Directors, and he has also served as a Course Developer for Cisco Systems. He is the author of OSPF Network Design Solutions from Cisco Press as well as other networking books from other publishers. Tom is currently a Senior Network Consultant designing and implementing secure Voice and Data networks as a part of the US Networks team.