Ron Gilster (CCNA, CCSE, i-Net+, Network+, A+, MBA, and AAGG) has been involved with Cisco networking and internetworking since 1993 as a trainer, teacher, developer, merchant, and end user. He has more than 35 years of total computing experience, including more than 15 years involved with the networking of computers. Ron is semi-retired, writing and teaching the occasional college course. He is the author of CCDA For Dummies, Cisco Networking For Dummies, A+ Certification For Dummies, Network+ Certification For Dummies, Server+ Certification For Dummies, and i-Net+ Certification For Dummies, plus several books on networking, including wireless networking, the Internet, computer hardware, computer and information literacy, and programming.