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2 way communication address resolution protocol arbitrary strings arp ascii texts bottom level cgi script chat rooms clien client address 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 different systems distinct areas dns server configuration domain name electronic message electronic messages email explanations file transfer protocol file transport free counter 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 large organization level protocols line zero loose source route mail mail adress mail command mail exchange record mail gateway mail request mail servers mail session mail telnet mailbox name malicious users menus message response microsoft exchange server milliseconds motivation mx mail mydomain myriad necessary parameters netmail network news transfer protocol network protocol network protocols nntp novell groupwise open source program osi output structure packet internet groper pairs panel files perl program perl script personal computer pipes 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 sending a message sending messages sensible option server ftp server side script site connection smtp commands smtp protocol smtp server smtp works source route stateless protocol syntax target name tcp ip protocol tcp ip tcp ip tcp port technical article telnet smtp telnet telnet telnet virtual three steps time employee time to live timeout tos tracert command traffic systems transactions transfer protocol ftp transmission channel transport level ttl field typing errors udp unix computers unix to unix copy user datagram protocol validity web designers web server windows system word telnet workstations