A permanent virtual circuit (permanent virtual circuit) is a virtual circuit that is permanently available to the user just as though it were a dedicated or leased line continuously reserved for that user. A switched virtual circuit (switched virtual circuit) is a virtual circuit in which a connection session is set up for a user only for the duration of a connection. Pvcs are an important feature of frame relay networks and svcs are proposed for later read more inclusion. A virus is a malicious program whose sole intent is to cause problems on. There are anti-virus programs, such as mcafee and norton.
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