switchport mode options:
access prevents the use of trunking, making the port always act as an access (nontrunk) port.
trunk always uses trunking.
dynamic desirable initiates negotiation messages and responds to negotiation messages to dynamically choose whether to start using trunking, and defines the trunking encapsulation.
dynamic auto passively waits to receive trunk negotiation messages, at which point the switch will respond and negotiate whether to use trunking, and if so, the type of trunking.
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