The Network InterfaceLayer (NIL) is the lowest layer in the TCP/IP protocol stack. It ensures the adaptation of the data packets to the physical transmission media
. TCP/IP is designed to be independent of the access method, the frame format and the transmission medium. Therefore, TCP/IP is suitable for a wide variety of network types and can be used in both local area networks (LAN) such as Ethernet and wide area networks such as Frame Relay or ATM
.OSI reference model. Above the Network Interface Layer is the Internet Layer, which is responsible for addressing, packaging and routing. Among other things, the Internet Protocol (IP) resides on this layer.