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Published byAlvin Lyons Modified over 9 years ago
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1 CS4550 Computer Networks II Topics In Applications Ref: Feit Chap 13-20 Tanenbaum Chap 7
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Clients, requestor programs Servers, demon, reply peer Telnet FTP SNMP E-mail WWW Telnet FTP SNMP E-mail WWW TCP UDP IP DL and physical TCP UDP IP DL and physical From Port 23 From Protocol 6 To port 23 To protocol 6 General Architecture
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Common Tools PingEcho 7/udp netstattime 13/udp traceroute tracertquote 17/udp
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TELNET First Application Connect as a terminal to a networked host Terminal emulation Telnet to selected port Commands
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Connect as a terminal to a networked host NVT - Network Virtual Terminal Solves Multi vendor problem NVT code - 7 bit USASCII 128 characters Line Format- half duplex, stop and wait, Command Format - Interpret As Command (IAC) Escape character IAC = 255 note 8’th bit set IACCommandoption 25525124 willterminal type
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Terminal emulation
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Telnet cs.nps.navy.mil 7 echo service telnet cs.nps.navy.mil 13 time of day service telnet cs.nps.navy.mil 80 www service telnet cs.nps.navy.mil 25mail service type help Connect to a selected port
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Telnet Commands get a list of commands Wolf> telnet telnet > ?
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