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In Cisco Catalyst switches, each switchport can be set to different VLAN Membership modes using the "switchport mode" command. This sets the port unconditionally.

The different modes include

"access" – Sets the port to access mode (static-access or dynamic-access). Thiss unconditionally sets the port as an "Access port" and a nontrunking, single VLAN interface. This disables "Dynamic Trunking Protocol (DTP)" on the switchport.

"trunk" – Set the port to trunk mode, as a trunking VLAN Layer 2 interface.

"dynamic auto" – Sets the interface to Dynamic trunking mode and runs "Dynamic Trunking Protocol(DTP)". It will automatically convert the link into a trunk if connected to a switchport with "mode dynamic desirable" or a switchport in "Trunk" mode. 

"dynamic desirable" – This is the default mode a switchport is set. Sets the interface to Dynamic Trunking and runs DTP. It will form a trunk when connected to a switchport in "dynamic (auto or desirable)" or trunk mode.

The command syntax is

ciscoswitch(config-if)# switchport mode <access/trunk/dynamic[desirable/auto]>

For example, to set the port to Access mode

ciscoswitch(config-if)# switchport mode access

To set a port to Trunk but disable DTP

ciscoswitch(config-if)# switchport mode trunk

ciscoswitch(config-if)# switchport mode nonegotiate