The TCP/IP model is a more concise take on the OSI model. The TCP/IP model contains four layers: Process/Application Layer Host-to-Host/Transport Layer Internet Layer Network Access Layer/Link Layer Network Access Layer The Network Access Layer defines how to use the network to transmit an IP datagram, or unit of information packet. The Network Access Layer is: the lowest layer physical, data link, network a directly attached network the protocols provide the means for the system to deliver data to other directly (physically) attached network devices. must be able to know the details of the underlying network (packet structure, addressing, etc.) Gateways are devices that switch packets between different physical networks.…