How do you configure DTP in auto mode on a switchport?

Configuring Dynamic Trunking Protocol (DTP) in auto mode on a switch port is accomplished by using the command that explicitly sets the mode of the port to dynamic auto. In dynamic auto mode, the switch port will negotiate trunking with the connected device, allowing the switch to respond to DTP messages from the other end. If the neighboring switch port is in trunk mode or dynamic desirable mode, a trunk link will be formed.

This particular command is the correct syntax recognized by Cisco's IOS for configuring the port automatically to negotiate trunking. The phrasing "dynamic auto" indicates the port listens for DTP messages but does not initiate in the trunk negotiation process unless the partner device requests it.

The other choices do not correctly configure the switch port for DTP in auto mode. Some might use incorrect terminology, which cannot be interpreted by the IOS. Understanding the correct syntax is essential for effective network configuration.