netscape
(or
InternetExplorer,
or even
lynx
) to fetch an RFC -- RFC854 (telnet) might
be a good one. You can do this by clicking on the URL given in the
first slide of the
lecture.
man ascii
at the command line. Try it.
/etc/services
on a nearby
Unix system: it defines the mapping between TCP port numbers and
application protocols. Find the port numbers for
echo
, finger
and
chargen
. Use telnet to connect to each of
these ports. What do they do? Note that on some systems the telnet
program accepts symbolic, or service, names on the command line.
You might care to try it, eg:
telnet ironbark.bendigo.latrobe.edu.au finger
rlogin
from one of the campus Unix
systems to another Unix system. Do you notice any difference
between the way it operates, compared to telnet?
ssh
to to log in from one of the Unix
systems to another on campus. Any difference?