Quick description of how DHCP works, what DHCP Snooping is and an example of how to configure it on a Cisco switch.
Snooping on your Boyfriend's phone - IMO Ep. 412
IGMP Snooping and VLC player
Cisco DHCP Snooping & Dynamic ARP Inspection
Cisco CCNA Security Training - DHCP Snooping
WettieTV - Snapper Snooping