What is Virtual Private Network Introduction to VPN

ByApex TG India Pvt Ltdhttp://www.apextgi.in

http://www.apextgi.in/

VPN

A virtual private network that is established over, in general, the Internet

It is virtual because it exists as a virtual entity within a public network

It is private because it is confined to a set of private users

Why is it a Virtual Private Network?

From the users perspective, it appears as a network consisting of dedicated network links

These links appear as if they are reserved for the VPN clientele

Because of encryption, the network appears to be private

Tunnel and Connections

Tunnel The portion of the network where the data

is encapsulated Connection

The portion of the network where the data is encrypted

VPN Major Characteristics

Must emulate a point-to-point link Done by encapsulating the data that would

facilitate allow it to travel the Internet to reach the end point

Must emulate a private link Done by encrypting the data in the data

packets

Typical VPN Connection

Tunnel and Connections

Tunnel The portion of the network where the data

is encapsulated Connection

The portion of the network where the data is encrypted

Application Areas

In general, provide users with connection to the corporate network regardless of their location

The alternative of using truly dedicated lines for a private network are expensive propositions

Some Common Uses of VPN

Provide users with secured remote access over the Internet to corporate resources

Connect two computer networks securely over the Internet Example: Connect a branch office network to the

network in the head office Secure part of a corporate network for security

and confidentiality purpose

Remote Access Over the Internet

Connecting Two Computer Networks Securely

Securing a Part of the Corporate Network

Basic VPN Requirements

User Authentication Address Management Data Encryption Key Management Multi-protocol Support

User Authentication

VPN must be able to verify user authentication and allow only authorized users to access the network

Address Management

Assign addresses to clients and ensure that private addresses are kept private on the VPN

Data Encryption

Encrypt and decrypt the data to ensure that others on the not have access to the data

Key Management

Keys must be generated and refreshed for encryption at the server and the client

Note that keys are required for encryption

Multi-protocol Support

The VPN technology must support commons protocols on the Internet such as IP, IPX etc.

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Slide 1VPNWhy is it a Virtual Private Network?Tunnel and ConnectionsVPN Major CharacteristicsSlide 7Application AreasSome Common Uses of VPNRemote Access Over the InternetConnecting Two Computer Networks SecurelySecuring a Part of the Corporate NetworkBasic VPN RequirementsUser AuthenticationAddress ManagementData EncryptionKey ManagementMulti-protocol SupportSlide 19