Answer Posted / mohit yadav
A VPN connection is the extension of a private network that
includes links across shared or public networks, such as
the Internet. VPN connections (VPNs) enable organizations
to send data between two computers across the Internet in a
manner that emulates the properties of a point-to-point
private link.
Basically, a VPN is a private network that uses a public
network (usually the Internet) to connect remote sites or
users together. Instead of using a dedicated, real-world
connection such as leased line, a VPN uses "virtual"
connections routed through the Internet from the company's
private network to the remote site or employee.
VPN Virtual Private Network, A service which provides
Secure network connectivity between two remote locations
over a insecure network(internet/ISP).
VPN is a virtual path network. it travels packet over
unprotected network e.g internet in a secured manner.
for this it is using IPSEC for authentication, data
integrity , confidentiality.
For security IPSEC is using AH, ESP,ESP + AH. for
encryption it is using DES, 3DES & AES.For authentication
MD5, SHA.For protection it is using DH1, DH2, DH5 & DH7.
Encrption are of two types.Symetric and Asymetric.
Symetric - Each peer uses the same key to encrypt and
decrypt Data.
Asymetric - Each peer uses the different key to encrypt and
decrypt the data.
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