I remember seeing a Security Analyst for the DC I worked for take down 6 racks worth of Cisco Catalyst 12000 series router hardware once. They had a HSRP inter

I remember seeing a Security Analyst for the DC I worked for take down 6 racks worth of Cisco Catalyst 12000 series router hardware once. They had a HSRP interface set up at the .1 address, and the security analyst set his laptop up with the same static .1 IP address and plugged it in. Instant outage.