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A VPN: provides secure, encrypted communications using Telnet. is an Internet-based service for delivering voice communications. is an encrypted private network configured within a public network. is a proprietary networking service technology developed by individual corporations. is more expensive than a dedicated network.

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Answer and Explanation:

VPN is an encrypted private network configured within a public network.

Typical applications are for employees accessing corporate network (private) through Internet (public).  Encryption and credentials contribute to security despite using a public network.