Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

The command 'ip dhcp snooping trust' is used to designate specific ports on a network switch as trusted, allowing them to send DHCP packets. When this command is applied to an interface, the switch will permit incoming DHCP messages from the trusted device, which usually is a legitimate DHCP server. This is crucial in preventing unauthorized DHCP servers from being able to assign IP addresses to clients on the network. By trusting specific ports, network administrators can enhance security measures against rogue DHCP servers that may attempt to distribute incorrect IP configurations.

The other options do not accurately describe the function of this command. Disabling all DHCP services would prevent any DHCP communication, which is not the purpose of the command. Restricting DHCP services to specific VLANs is handled through different configurations, not directly by the 'ip dhcp snooping trust' command. Enforcing DHCP server authentication involves additional configurations beyond simply marking a port as trusted. This command specifically focuses on allowing DHCP messages from devices identified as trusted within the network infrastructure.