What is the operational mode of a switchport if both connected ports are set to dynamic desirable?

When both connected ports of a switch are configured to dynamic desirable mode, they negotiate to establish a trunk link between them. In dynamic desirable mode, a port actively attempts to form a trunk with the device it is connected to by sending Dynamic Trunking Protocol (DTP) 'advertisements.' As both ports are set to this mode, they will successfully negotiate and transition into a trunking state.

Trunking is necessary when a switch needs to carry traffic for multiple VLANs across a single link. Therefore, establishing a trunk link allows the traffic from different VLANs to be tagged appropriately, which is essential for maintaining VLAN segmentation across a network.

Other configurations such as access, dynamic auto, or disabled do not apply in this scenario, as they represent other states or configurations of switchports that do not actively negotiate or support multi-VLAN traffic over a single link. Access mode is intended for single VLAN traffic, dynamic auto passively waits for DTP negotiations, and disabled means the port is not operational. In contrast, both ports in dynamic desirable will lead to a trunk configuration.