For this homework assignment, please write a $250-$word essay to tersely describe two different communications protocol systems that pre$-$dated the roll$-$out of the Internet in the $1990$s$.($The Internet uses the TCP$/$IP protocol suite so do NOT report on TCP$/$IP$.)$ Examples of pre$-$Internet protocols include OSI $($i$.$e$.,$ OSI protocol family, not the OSI Reference Model$),$ DECnet Phase III, DECnet Phase IV$,$ WANGnet, IPX$/$SPX$,$ BSC$,$ SNA, AppleTalk, Ultranet, Hypernet, XNS$,$ HAM, HP AdvanceNet, Banyan Vines, Apollo Domain, NetBeui, etc. Data communications protocols use bi$-$directional communications so TV and commercial Radio, both of which are uni$-$directional, are not data communications protocols.