The concepts for what you want to know can be found here:

The visual representation for what you want to know can be seen here:

Hope this helps, btw...there are black hats on this forum, but the general attitude of most people on this forum is more white hat.

In other words, no one is going to tell you which 1337scr1ptz you should use, or how to h4xx computarz.

said:

So if its white hat lets add more how to protect from backdooring and stuff like that?

No problems, just wanted to make you aware.

To protect from bind shells, you can install an inbound firewall. Host-based firewalls will allow you to block incoming traffic on specified ports, or all ports except ones you want to be open.

One method of protecting from reverse shells is installing some sort of IPS (intrusion prevention system). With the reverse shell scenario, you will probably be better off with a NIPS (network IPS), than you would with a HIPS (host IPS), because with a NIPS it will prevent commonly seen attacks across the entire network, as compared to a single machine with a HIPS.

For networks running CISCO devices, the ideal scenario would be to implement deep packet inspection on your firewall. It will slow down traffic slightly, but it is by far one of the most effective ways of blocking unwanted traffic coming in, or going out of your network.