easiest way to shut down all network services besides ssh?

[Britton Kerin <britton.kerin@gmail.com>]

I have a system that I would like to make accessible only by ssh.

No apache telnet ftp anything else.

What is the easiest way to achieve this?  It came from a vendor with
a slew of package of all sorts, so I don't even know everything that
I want to remove.

Thanks,
Britton