wiki
portcall
Ports are like doors to a computer each computer has many ports. Without any open ports your computer wouldn't be able to access the internet, to find open ports you can try a portscan
The more ports you have open on a system the larger the attack surface is. This means the more chances a malicious attacker has to get into your system and do something bad. It is similar to having holes in a boat - the fewer, the better.
Open the ports in a computer depends on the platforms and operating system being used . Open the Windows Firewall by clicking the Start button and clicking on the Control Panel. On the left pane, there is the Advanced settings which will open the ports.
There can be a maximum of 65535 ports on any computer system. To find out which ones are in use, use the 'netstat' command.
Type your answer here... Network mappers
You have to setup a router and open the ports in the router for this purpose. But Pacenet have blocked many ports so you can go to their local office and ask them to open the ports.
penetration is trying to get into a lan or client (ie. threw a open port) vulnerability is trying to find out if there is anything you can get into (trying to find if there are any open ports)
NoYou can open the computer up and remove the USB ports.
Registered Ports
firewall
A website that shows how to open ports in a firewall is the Sever Fault website. Another website that shows how to open ports in a firewall is the Windows website.