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2 way communication address resolution protocol arp bottom level chat rooms client configuration client server model computer area connection ip connexion control break control message copy 2 datagram deeper and deeper default port description files destination host destination mailbox distinct areas domain name email file transfer protocol file transport ftp client ftp clients ftp commands gopher gopher gopher news hardware address have been granted hops host administrator host computer host computers host list host server http server hypertext transfer protocol informal communication initial line internet control message protocol internet level ip address ip sockets level protocols line zero loose source route mail mail command mail request mail servers mail session mail telnet mailbox name menus message response milliseconds motivation mydomain necessary parameters network news transfer protocol network protocol network protocols nntp osi output structure packet internet groper pairs panel files personal computer protocol query data query output query result rarp remote computer remote computers reply request message resolve response message response messages rfc 821 routers script output server ftp server side script site connection smtp commands smtp protocol smtp server source route stateless protocol syntax target name tcp ip protocol tcp ip tcp ip technical article telnet smtp telnet telnet telnet virtual three steps time to live timeout tos tracert command transactions transfer protocol ftp transmission channel transport level ttl field udp user datagram protocol web server windows system word telnet