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Access control is really a system enabling authorities to manage usage of areas and resources in a very given physical facility or computer-based information system. Access control is, in reality, perhaps the most common, everyday phenomenon. For example, a lock over a car door is basically a sort of access control. The PIN with a bank's ATM method is another way of access control. Even nightclub bouncers, waiting in front of the door, are another instance of (perhaps) a more primitive mode of access control. Using an access control mechanism is important when persons seek to secure confidential, important, or sensitive information and equipment.
As a matter of fact, there is no problem, but only situation that should be solved. In order to enforce acceptable network use policies and provide security including anti-virus, anti-malware or anti-spam services computer user can use proxy servers. To lessen network traffic plus an capability to enhance network security are the most tempting and indispensable functions of proxy servers. A proxy server enhances network security by controls for receiving and forwarding (or rejecting) requests between isolated networks, for instance, forwarding requests across a firewall. A proxy server lessens network traffic by rejecting unwanted requests, forwarding requests to balance and optimize server workload, and fulfilling requests by serving data from cache in lieu of unnecessarily contacting the true destination server.
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