Resource Dynamics, Inc.

Tele-Support HelpDesk Hot Tips

Question:

What is VPN:

Answer:

Basically, when a VPN is used, it extends the client PC into the network of the host PC generally using the internet. This makes it appear as if the client PC is physically connected to the host PC's network, allowing all shares as if the client PC is local. Of course running a VPN over a 28.8k modem would be slow, it would work. Its a way of cutting costs.  For best performance, you should use cable or dsn for your connection.

Virtual Private Network 

(VPN) The use of encryption in the lower protocol layers to provide a secure connection through an otherwise insecure network, typically the Internet. VPNs are generally cheaper than real private networks using private lines but rely on having the same encryption system at both ends. The encryption may be performed by firewall software or possibly by routers. 

Link-level (layer 2 and 3) encryption provides extra protection by encrypting all of each datagram except the link-level information. This prevents a listener from obtaining information about network structure. While link-level encryption prevents traffic analysis (a form of attack), it must encrypt/decrypt on every hop and every path.  

Protocol-level encryption (layer 3 and 4) encryption encrypts protocol data but leaves protocol and link headers clear. While protocol-level encryption requires you to encrypt/decrypt data only once, and it encrypts/decrypts only those sessions that need it, headers are sent as clear text, allowing traffic analysis. 

Application (layer 5 up) encryption encryption is based on a particular application and requires that the application be modified to incorporate encryption.

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