Internet filtering devices restrict access to websites in accordance with the rules set by a network's administrator. These rules typically filter traffic by the website's address (URL), content presented on the website or the type of file being accessed.
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Filtering traffic by category
The administrator who installs an Internet filter can choose what categories of websites to restrict. For instance, the administrator may block all social media, pornography, and online retail websites. Before allowing a website to be accessed, the filter determines if the website is part of a restricted category by comparing the website's address against a database of categorized websites.
Filtering traffic by restricting keywords
Another way to filter Internet traffic is to compare the text on the website with a list of restricted keywords. If a prohibited keyword is found on a website, the site may be blocked or timed, depending on the rules set by the administrator.
Filtering traffic by file type
Internet filters can also filter traffic based on the type of file being accessed. For instance, an employer may block access to online radio websites in an effort to preserve bandwidth for business use.
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