Virtual Private Network ( Vpn )

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What is a Virtual Private Network?

A virtual private network (VPN) is an addition of a private network that bridges the connection between a shared or public network. It allows you to send data between two computers in a point to point private link (Microsoft, Virtual Private Networking: An Overview). VPN allows individuals and companies to connect two locations securely and remotely. For example, if one company branch is in Secaucus, NJ and the other is in Newark, NJ; they can securely access the central resources and communicate with each other.
Types of VPN?
The common uses of a Virtual Private Network are: Remote Access over the Internet, Connecting Networks over the Internet, and Connecting Computers over Intranet. Remote access or PPTP VPN is the most commonly used VPN protocol. It enables the user to connect to the VPN network using a password login. They don’t require extra resources such as expensive hardware and are usually available in an inexpensive software.
Site to Site VPN allows different sites of the same organization to have their own network to connect together and form a VPN. It can be hardware or software based.
Layer to Tunneling Protocol (L2TP) is similar to PPTP as not only it provides data confidentially but also data integrity. L2PT was invented by Cisco and Microsoft (Personalized). Image below drawn by Cisco.

Layer 2 Protocol tunneling allows data units to be tunneled through a network. Edge Switch is connected to the client switch
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