A few questions about IP and Port information

[Guest]

[kazuya]

If you leave the port and IP destination settings on any for anything that conects to the network, despite the firewall monitoring everything, securty will not be 100% as other items can hijack whatever legitimate program is trying to communicate to either the network or your system ?

Where as specificly telling the firewall what item should be using what IP and Port would make the system hacker proof ?
Where it says port and IP destinations, would that mean on the system or are these for whatever server a program is being sent from ?

[Tags:]