The OSI model uses the terms “Connection-mode” and “Connection-oriented” for the connection model and the term “Connectionless-mode” for the connectionless model. TCP/IP Internet layer VS OSI Network layer The Internet layer of the TCP/IP model is compared to the Network layer of the OSI model. Both models support “Connectionless” network services, but only the Network layer supports connected-oriented services. The OSI layer is a “catch-all” for all protocols that assist in network functionality, where the “Internet” layer of the TCP/IP model assist in internetworking using Internet Protocol.
TCP/IP Link layer VS OSI Data Link and Physical layer The Link Layer of the TCP/IP model is often compared directly with the Data link layer and the Physical layer in the Open Systems Interconnection (OSI) protocol stack. The Link Layer in TCP/IP is still wider in scope and it holds a different concept. This can be observed by certain protocols, such as the Address Resolution Protocol (ARP), which is confined to the Link Layer in the TCP/IP model, which fist between OSI model Data Link Layer and the Network Layer. Majority of the time, the lower layers below the Interface or Network layer of the TCP/IP model are rarely discussed.