First, you have to learn what sort of protection against intruders exists on your network, both at the site of your ISP and at your own site. Then learn what sort of connections you have to the outside world. Of course, this will include your DSL or cable connection, but it may also include dial-up access available to individual computers. Even if it’s just your home office, knowing that someone can dial out to the Internet over a phone line bypassing your firewall is important when you’re fighting against worms, viruses and intruders.

You’ll also need to be familiar with the protective devices and software on your network. Do you have a firewall? Do you know how to use it? Do your computers have personal firewalls? Do you have adequate physical security? Do you have anti-virus, anti-spam and anti-spyware products installed?

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