The Internet standardized networking worldwide. Every home and business uses the Internet's TCP/IP and Ethernet protocols. See
TCP/IP and
Ethernet.
Nevertheless, within the enterprise, it is still a daunting task keeping a mix of client machines running Windows and macOS, servers running Linux, Unix, Windows or z/OS as well as iOS and Android mobile devices all communicating with each other in a secure manner. See
enterprise networking,
client/server,
OSI model and
standards.