Where does a switch maintain DHCP snooping information?

A

The correct answer is A, in the DHCP binding database.

DHCP snooping is a security feature on switches that helps prevent unauthorized DHCP servers from providing IP addresses to network clients. DHCP snooping maintains a database of trusted DHCP servers, and inspects DHCP messages exchanged between DHCP clients and servers to ensure they are valid and authorized.

When a switch is configured for DHCP snooping, it creates a DHCP binding database that stores information about the DHCP clients and servers on the network. This database contains the MAC address of each DHCP client, the IP address assigned to it, the lease time, and the port on the switch where the client is connected. The switch uses this information to verify DHCP requests and responses, and to drop any messages that do not match the database.

The MAC address table (option B) is used by switches to keep track of the MAC addresses of devices connected to each port. It is not related to DHCP snooping information.

The VLAN database (option C) is used to store information about the VLANs configured on the switch, including VLAN IDs, names, and associated ports. It is not related to DHCP snooping information.

The CAM table (option D) is used by switches to map MAC addresses to the corresponding switch ports. It is related to option B but not to DHCP snooping information.

Therefore, the correct answer is A, in the DHCP binding database.