The net object represents the Ethernet interface of your device. This object only specifies various parameters related to the Ethernet interface and is not responsible for sending/transmitting network data. The latter is the job of the sock object.
Here is what you can do with the net object:
Check if the Network Interface Controller (NIC) IC is functioning properly.
Check your device's Ethernet MAC address.
Set the IP-address of the Ethernet Interface.
Set default gateway IP and the netmask.
Be notified when the Ethernet cable is plugged or unplugged and check current link status.
Be notified when data overflow occurs in the NIC.