How can you configure a switch interface to be an access port?

To configure a switch interface as an access port, the command that is correctly used is to set the port explicitly to access mode which is done using the command "switchport mode access." This command defines the interface to operate in access mode, where it can only belong to a single VLAN, as opposed to trunk mode where it can carry traffic for multiple VLANs.

When setting an interface to access mode, this configuration ensures that the switch will treat frames received on this interface as belonging to the specified VLAN, simplifying the management of network traffic. This is especially useful in scenarios where the port connects end-user devices like computers and printers that only require a single VLAN for their traffic.

The other options do not represent valid configurations for setting an access port. Choosing the correct command is critical for ensuring that the network functions as intended, particularly in VLAN distributions and managing untagged traffic from devices.