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Answer Posted / 909
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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