If the neighbor switch is set to trunk or dynamic desirable, which command should you configure to form a trunk?
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Correct answer: configure switchport mode dynamic desirable.
Why this is the answer
The switchport mode dynamic desirable command configures an interface to actively attempt to convert the link into a trunk link. If the neighboring switch port is set to trunk, dynamic desirable, or dynamic auto, a trunk will form. switchport nonegotiate disables DTP (Dynamic Trunking Protocol) and forces the port into a trunk, but it won't negotiate with the neighbor. switchport mode dynamic auto makes the port willing to convert to a trunk link if the neighboring interface is set to trunk or dynamic desirable, but it will not actively attempt to initiate trunking. switchport trunk dynamic desirable is not a valid command.
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