What command is used to disable Dynamic Trunking Protocol (DTP) negotiations on a Cisco switch interface?

The command you specify, "switchport nonegotiate," is designed to disable Dynamic Trunking Protocol (DTP) negotiations on a Cisco switch interface. By using this command, the switch will not attempt to negotiate trunking with neighboring interfaces and will effectively operate in a static mode instead. This is particularly useful in scenarios where you want to ensure that a trunk is configured in a controlled manner without automatic negotiation.

When DTP is disabled, the interface will not send DTP packets, and it will not automatically change to a trunk link based on the DTP negotiation process. This is often utilized to enhance security and prevent unintended trunk connections from being established.

In contrast, the other options provided are not suitable for disabling DTP negotiations. For example, simply configuring an interface as "no switchport mode trunk" would remove the trunk mode but still allow for potential DTP negotiations to occur, depending on the configuration of the neighboring device. Configuring "switchport mode access" changes the port to access mode, which inherently does not use trunking, but it doesn't specifically disable DTP; it just prevents the interface from being in trunking mode at all. The term "disable trunking" is not a valid Cisco command and does not