David Davis (CCIE 9369, VCP, MCSE, CISSP) is an Infrastructure Manager at Train Signal video training and the author of various video training products including the following: Train Signal VMware ESX Server, VMware Server & Workstation, Microsoft Virtual Server, and many more. He has 15+ years in system/network administration and infrastructure management. He has written hundreds of articles on virtualization and networking, some of which appear on his websites HappyRouter.com & VMwareVideos.com.