used for what ?
there are plenty of default network services that you can disable when you do not need them - I do not know your requirements - in most companies I worked for, we disabled pretty much all of these: shell, kshell, login, klogin, exec, tftp, rwalld, sprayd, echo, discard, chargen, daytime, time
You might want to have a look
here
Regards
zxmaus