Layer 3 establishes the route between sender and receiver across switching points, which are typically routers. The most ubiquitous example is the IP protocol in TCP/IP (see TCP/IP). IPX ...
Ethernet is a layer 2 data link protocol that is widely used with the TCP/IP protocol ... to learn about the protocol layers (see OSI model). The IP layer 3 breaks apart the data being transmitted ...
A top-down exploration of networking using the 5-layer model and the TCP/IP stack. HTTP, FTP, DNS, BSD Sockets, concurrent servers, checksums, reliable transport with stop-and-wait, go-back-n, ...