Data Link Layer Question:
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Explain VPN?


A VPN is a service that offers secure, reliable connectivity over a shared public network infrastructure such as the Internet. VPNs maintain the same security and management policies as a private network. They are the most cost effective method of establishing a virtual point-to-point connection between remote users and an enterprise customer's network.

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What is Spanning-Tree Protocol (STP)?Tell me why data link layer is divided into two layers?