HACKING : Simulation of internet attacks (port scanning)

In exchanging data (sending email or accessing a network, for example), a PC uses
input/output ports. These ports can also be entry points for hackers
and certain types of viruses (e.g, Sasser, Blaster, etc)

You should install a firewall software to protect your computer against these kinds of threats.
(Windows XP provides a basic firewall)

A firewall will close unused ports and monitor open ports for intrusion attempts.

In order to check how "hackproof" your system is,
PC Security Test simulates a "port scanning attack".

If you have a firewall installed, it should report the attack as such.