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Most large businesses, organizations, and universities these days use a proxy server. This is a server that all computers on the local network have to go through before accessing information on the Internet. By using a proxy server, an organization can improve the network performance and filter what users connected to the network can access.
A proxy server improves Internet access speeds from a network primarily by using a caching system. Caching saves recently viewed Web sites, images, and files on a local hard drive so that they dont have to be downloaded from the Web again. While your Web browser might save recently viewed items on your computer, a proxy server caches everything accessed from the network. That means if Bob views a news story at cnn.com at 1:00 and Jill views the same page at 1:03, shell most likely get the page straight from the proxy servers cache. Though this means super-fast access to Web pages, it also means users might not be seeing the latest update of each Web page.
The other main purpose a proxy server is to filter what is allowed into the network. While HTTP, FTP, and Secure protocols can all be filtered by a proxy server, HTTP is the most common. The proxy server can limit what Web sites users on the network can access. Many organizations choose to block access to sites with objectionable material such as hacking information and pornography, but other sites can be filtered as well. If an employer notices workers are spending too much time at sites like eBay or Quicken.com, those sites can be blocked by the proxy server as well.
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