How can you disable DTP on a switch port?
A. Configure the switch port as a trunk.
B. Add an interface on the switch to a channel group.
C. Change the operational mode to static access.
D. Change the administrative mode to access.
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Answer D.
Switchport Mode Access: This puts the interface into a PERMANENT NON-TRUNKING mode and negotiates to convert the link into a NON-TRUNK link. The port would be a dedicated Layer 2 access port!
Switchport Nonegotiates: Prevents the interface from generating DTP Frames (disables DTP). You can use this command ONLY when the interface switchport mode is already in ACCESS or TRUNK mode.
Configuring the interface as a static trunk port (“switchport mode trunk”) without the “nonegotiate” command (Answer A) will not work because DTP still runs. See: http://packetlife.net/blog/2008/sep/30/disabling-dynamic-trunking-protocol-dtp
The DTP packets are not sent in these three circumstances:
1.) Either the port is a static access port configured by the command switchport mode access
2.) Or the port is a static trunk port configured with the command switchport mode trunk and at the same time, the DTP negotiation is deactivated using the command switchport nonegotiate
3.) The port is a routed port configured with the command no switchport