A device that permits only requested traffic to enter a computer system is known as a(n) :

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A device that permits only requested traffic to enter a computer system is known as a firewall. Internet cache is a mechanism for the temporary storage of web documents to reduce server lag, network traffic manager manages network traffic, CPU is the central processing unit, and a cookie is a small file stored on a user's computer by a web browser.

A Device That Permits Only Requested Traffic to Enter a Computer