The email it sent claimed to be from your system administrator. It would tell you that your email account had been infected by a virus and that you should open the attached file to get instructions. Once you opened the attached file, your system was infected. What is this?

What is IPv4 length?

… is fast becoming as big a problem, even bigger than viruses.

What can you do with a firewall to help protect against virus attacks?

The point where the backbones of the Internet connect is called what?

By now you are aware, in a general way, of the dangers of the Internet, and you have ........a few basic rules for protection on the Internet.

A … is basically an intelligent hub; it works and looks exactly like a hub, with one significant difference. When a … receives a packet, it will send that packet only out the port for the computer to which it needs to go. A … essentially a hub that is able to determine where a packet is being sent.