题目内容
Most firewalls include a special computer called a(n) _______ server to manage communications between the internal networks and the outside world.
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People that collect and sell personal data are called _______.
These programs record virtually everything you do on your computer and are used by employers to search employee e-mail and computer files.
Small data files that are deposited on a user's hard disk when they visit a website are called _______.
These are used by advertisers to keep track of your web activity as you move from one site to the next.
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