Functions of TCP/IP Layers.
The TCP/IP model is a four-layer model that divides network communications into four distinct categories or layers.
The model is often referred to as the TCP/IP stack.
The four important layers are the application layer, the transport layer, the network layer, and the link layer.
The transport layer provides a total end-to-end solution for reliable communications.
TCP/IP relies on the transport layer to effectively control communications between two hosts.
When an IP communication session must begin or end, the transport layer is used to build this connection.
The Internet Layer of the TCP/IP model aligns with the Layer 3 (Network) layer of the OSI model.
This is where IP addresses and routing live.
When data is transmitted from a node on one LAN to a node on a different LAN, the Internet Layer is used.