A firewall is your first line of defence from unwanted visitors. You should always use a firewall at the point where your computer or network meets the Internet. Where you have more than one computer connected you may even want to consider putting a firewall on each one.
| • | Juniper Netscreen | Network Appliance |
| • | Kerio Personal Firewall | Software for Windows |
| • | McAfee Personal Firewall | Software for Windows |
| • | Norton Personal Firewall | Software for Windows |