No, if you host 100% of the network you are allowed. This is called "Penetration Testing" and is beneficial to help find flaws in your network that you may not be aware about. If you however do not host the internet then yes it would be illegal as you could cause a disruption to other people with the same ISP.
Advantages, new system can be tested before lunch through hacking
no
There are many different network hacking books on Amazon. Examples are: Violent Python: A Cookbook for Hackers, Hacking: The Art of Exploitation, etc.
not at all
No one that I know of. Hacking is perfectly legal as long as you do it on your own network. Cracking is what you're probably talking about- more people than you can count have been to jail. Learn the difference XD
No and it never will be
No, but it can mess up the game itself.
If you are wise, you don't. Hacking is illegal and you can get in LEGAL trouble for it.
one of the ways you can implement, is to install a firewall in your network to prevent unauthenticated users from accessing your network.
Stop HACKING!!
You can always be banned for hacking a game when your are using the internet on a console game. It's different if you do not play on a network with a hack because how can anyone even know.
Yes dont do it my friend did and got in a lot of trouble