Arekushisu-kun

Hello there everyone my name's Arekushisu I'm glad I joined a forum full of smart people that can help me with my homework. Can you help me explaining what the following acronyms mean? ARPA, ANSI, ASCII, CCITT, EIA, FCC, IEEE, IETF, ISO, ITU-T, ISP, LAN, MAN, NAP's, RFC, TCP/IP, WAN Help would be appreciated.