You are looking at a very old, but free version of the course.
If you are interesed the most recent version, check it out
on the Perl Maven site.
Chapter 8. Networking devices
When trying to connect some network device using Perl you have a number of choices.
See the full stack of HTTP connections:
built in socket function and the Socket module
IO::Socket::INET using IO::Socket
Net::Telnet, Net::FTP, Net::SSH (wrapping ssh), Net::SSH::Perl, Net::*
At the lowest level you can use the built in socket function.
Using the Socket library provides several extra functions
and constants that will make your code cleaner and more portable.
See also perlipc
If you are interested in on-site trainings by the author, please
contact me directly.