Once you have created a dvSwitch at the vCenter Server, the next step is to connect ESXi hosts to the dvSwitch. ESXi hosts are ideally connected to a dvSwitch by mapping its physical network adapters to dvUplinks of the dvSwitch, but it is not mandatory though. ESXi hosts can be added to dvSwitch without really mapping any physical adapters to it, but you couldn't call that an act of connecting to a dvSwitch, as moving any VM to the dvSwitch will lose its network connectivity. Hence, it is recommended to always connect a host to a dvSwitch by mapping adapters.
The number of physical adapters that can be mapped to a dvSwitch from an ESXi host will depend on the number of dvUplinks configured on the dvSwitch created.
