How can I prevent the Cisco Catalysts 2950/2960/3550/3750 from being vulnerable to ARP Poisoning?
Can this be avoided with the ARP INSPECTION?
Well in general on Cisco kit you'd use any or all of "DHCP Snooping", "Dynamic ARP Inspection (DAI)" or just plain port-security. Now I just need to lookup which of these are supported by your kit - back in a minute.
EDIT - Just checked all switches support all three features but you'll want to be on 12.1(22) at least.