Our company is under attack. We have intelligence that someone is trying to send a virus into our computer. It's your job to help us protect ourselves.

Step 1

One way enemies can have access is through open ports on our computer. A port is a way to get into your computer. Imagine a port just like the door to your house. We can open the door or close the door to let people in or out.

But our computer doesn’t just have 1 or 2 'doors' they have lots of ports that information can go in and out of. In fact they have over 65,000 ports! (That's a lot of potential open doors). Each port is used for a different service. For example, when you are using email, the information this often through Port 25.

Let's find out which ports are open on our computer using a tool called nmap. This command will search all ports, so be patient.

Type this command:

nmap -p- localhost