Which command is used to enable DHCP snooping on a Cisco switch?

Enabling DHCP snooping on a Cisco switch is accomplished using the command "ip dhcp snooping". This command activates DHCP snooping globally on the switch, allowing it to monitor and control DHCP messages traveling through the network. By enabling this feature, the switch can differentiate between trusted and untrusted DHCP packets, providing an essential security mechanism against DHCP spoofing attacks.

Once DHCP snooping is enabled, the switch will only allow DHCP responses from trusted sources and can also log, rate-limit, or drop unauthorized DHCP packets, which prevents rogue DHCP servers from assigning IP addresses to clients.

The other choices do not represent valid commands in the Cisco IOS configuration and would therefore be ineffective for enabling DHCP snooping.