This is one of multiple videos explaining and demonstrating DHCP SNOOPING which is part of my GNS3 CCNA course. Go here to access the course: http://goo.gl/ZGlJGq The course includes: 1) Video Training 2) Simulations 3) GNS3 Lab Guides 4) Quiz questions to help you prepare for the exam 4) Software to create IPSec VPN tunnels 5) Software and calculators