Which command would you use to disable DTP negotiations on a switch?

To disable Dynamic Trunking Protocol (DTP) negotiations on a switch, the command "switchport nonegotiate" is used. This command prevents the switchport from participating in DTP, which automatically negotiates trunk links between switches. By applying this command to the interface, you ensure that it will not attempt to negotiate a trunk and will instead operate in access mode unless explicitly configured as a trunk.

Using "switchport nonegotiate" is particularly useful in scenarios where you want to enforce a strict configuration and avoid any automatic changes that could lead to unexpected behavior, such as inadvertently creating a trunk link with a neighboring switch.

Other options, such as disabling the switchport entirely or using commands that do not directly relate to DTP negotiation, would not accomplish the goal of disabling DTP. The focus on "switchport nonegotiate" serves as an essential practice in network management to maintain stable and predictable network topology configurations.