A virtual private network, or , is an encrypted connection over the Internet from a device to a network. The encrypted connection helps ensure that sensitive data is safely transmitted. It prevents unauthorized people from eavesdropping on the traffic and allows the user to conduct work remotely. traffic on the virtual network is sent securely by establishing an encrypted connection across the Internet known as a tunnel**.
**A remote access securely connects a device outside the corporate office.
A site-to-site ** connects the corporate office to branch offices over the Internet. Site-to-site s are used when distance makes it impractical to have direct network connections between these offices. Dedicated equipment is used to establish and maintain a connection. Think of site-to-site access as network* to network.
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2019下半年网络工程师上午真题（七）答案
原文：https://blog.51cto.com/14627907/2454680
