Emmett Dulaneynbsp;is author of 40+ books on certification and security, includingSecurity+ Study Guide, 5th Editionandi-Net+ Exam Cram. He is certification columnist for CertCities and an associate professor at Anderson University. He has held certifications from almost every vendor including CompTIA (A+, Network+, Security+), Microsoft, Novell, Cisco, IBM, LPI, and many others. He co-founded Mercury Technical Solutions.Michael Harwood(MCSE, A+, Network+, Server+, Linux+) has authored or co-authored three best-selling books on Network+. He is system manager for a multi-site network, and consults for a major networking firm.