dont think you can secure s system that it WILL be secure...if someones want to break in he will... there alwasy a way ....
Well i agree with memory, by definiton a network or computer connected to one is insecure no matter what the security. The connection is for some type of client or server share therefore there is access no matter what the security.

A network is a series of interconnected sytems utilizing shared resouces.

ergo= a network is insecure.