CS4550 Computer Networks II Topics In Applications Ref: Feit Chap 1320 Tanenbaum Chap 7

1
CS4550 Computer Networks IITopics In
ApplicationsRef Feit Chap 13-20Tanenbaum Chap
7

2
General Architecture
Clients, requestor programs
Servers, demon, reply peer
Telnet FTP SNMP E-mail WWW
Telnet FTP SNMP E-mail WWW
From Port 23
To port 23
TCP UDP IP DL and physical
TCP UDP IP DL and physical
From Protocol 6
To protocol 6
3
Common Tools Ping Echo
7/udp netstat time 13/udp traceroute
tracert quote 17/udp
4
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, ltCRgtltLFgt Command Format - Interpret As
Command (IAC) Escape character IAC 255 note
8th bit set IAC Command option 255 251 24
will terminal type
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Terminal emulation
7
Connect to a selected port
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 25 mail
service type help
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Telnet Commands
get a list of commands Wolfgt telnet telnet gt
?