Virtual Private Network ( Vpn )

2477 Words Jun 1st, 2016 10 Pages
Introduction – The Past:
Thirty years ago, there was no such need of privacy and data encryption as the Internet age had not taken off. In the 90s, VPN technology was still a fairly new technology but was predicted that it would be the next big thing in the early 2000s. Only large companies could afford the price to use dedicated lines to connect to remote locations. However, the disadvantages of the lease line are quite clear: Although large companies have the capitals and needs for building private networks, small and medium companies could rely on the less expensive, packet switched X.25 network. As the size of the Internet continued to grow, both small and large companies began to connect their private network with the public network.
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The Need for Secure Connection:
In the 1990s, People started realize Internet security when the Internet grow tremendously. VPN is important for transmitting information securely. Data breach can cause the loss of millions of dollars and expose clients contact information. It is an embarrassment that businesses would like to avoid at all cost.
Virtual Private Network – Site-to-Site and Remote-Access Architectures:
Virtual Private Network (VPN) is the technology that creates secure connection across the network. It uses TCP/IP network with different VPN technologies such as IPSec, SSL, L2TP, and MPLS, etc. In business, VPN implementations can be categorized into one of two different architectures: Site-to-site and Remote-access VPN. Both need some kinds of encryption to ensure the confidentiality, data integrity, authentication, and anti-replay. As their names imply, site-to-site VPN is to connect two networks together, so either network can securely communicate to each other. Remote-access VPN was traditionally for individual machine such as workstations and laptops to connect to cooperate network remotely. However, in recent years, tablets and smartphones have gained in popularity and are also fall into this category.
Site-to-site VPNs connection can be either site-site or site-branch network. In this architecture, VPN gateways play an important role by performing encapsulation/decapsulation and encryption/decryption: When a VPN
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