used exclusively by Enterprise IT departments within the enterprises they network. Most offices in
most buildings built after 1990 are pre-wired for Ethernet, with multiple Cat-5 cables pulled into
each office, ready to hook up. Because Ethernet is such a widely used protocol, large numbers of
technicians and programmers understand it, and can work with it. Microsoft Windows is designed
to work easily with Ethernet local area networks in the enterprise. The availability of Internet
connections and TCP/IP over Ethernet makes it possible to connect local networks to other
networks creating an enterprise-wide WAN.