What command disables Dynamic Trunking Protocol (DTP)?

What command disables Dynamic Trunking Protocol (DTP)?

• A. switchport mode access
• B. switchport mode trunk
• C. switchport nonegotiate
• D. switchport trunk allowed vlan

Answer: (C)

Disabling Dynamic Trunking Protocol (DTP) is accomplished effectively with the command that specifies "nonegotiate." When you configure an interface with this command, it prevents the port from attempting to negotiate a trunk link with the other end of the connection. This means that the port will not send out DTP messages, which are used to automatically establish trunking, therefore effectively disabling DTP on that interface. Using "switchport mode access" sets the port to an access mode, which would generally not expect trunking to be necessary, but the mode itself doesn't explicitly stop DTP from running. "Switchport mode trunk" forces the port into trunk mode but still allows DTP to negotiate a trunk if the other side is also set to negotiate. The "switchport trunk allowed vlan" command manages VLANs on a trunk but has no impact on DTP negotiation.

Disabling Dynamic Trunking Protocol (DTP) is accomplished effectively with the command that specifies "nonegotiate." When you configure an interface with this command, it prevents the port from attempting to negotiate a trunk link with the other end of the connection. This means that the port will not send out DTP messages, which are used to automatically establish trunking, therefore effectively disabling DTP on that interface.

Using "switchport mode access" sets the port to an access mode, which would generally not expect trunking to be necessary, but the mode itself doesn't explicitly stop DTP from running. "Switchport mode trunk" forces the port into trunk mode but still allows DTP to negotiate a trunk if the other side is also set to negotiate. The "switchport trunk allowed vlan" command manages VLANs on a trunk but has no impact on DTP negotiation.