TAILIEUCHUNG - Access VPNs and Tunneling Technologies

A virtual private network (VPN) is a network that extends remote access to users over a shared infrastructure. VPNs maintain the same security and management policies as a private network. They are the most cost effective method of establishing a point-to-point connection between remote users and an enterprise customer’s network. | Overview of Access VPNs and Tunneling Technologies Introduction A virtual private network VPN is a network that extends remote access to users over a shared infrastructure. VPNs maintain the same security and management policies as a private network. They are the most cost effective method of establishing a point-to-point connection between remote users and an enterprise customer s network. There are three main types of VPNs access VPNs intranet VPNs and extranet VPNs. Access VPNs Provide remote access to an enterprise customer s intranet or extranet over a shared infrastructure. Access VPNs use analog dial ISDN DSL mobile IP and cable technologies to securely connect mobile users telecommuters and branch offices. Intranet VPNs Link enterprise customer headquarters remote offices and branch offices to an internal network over a shared infrastructure using dedicated connections. Intranet VPNs differ from extranet VPNs in that they only allow access to the enterprise customer s employees. Extranet VPNs Link outside customers suppliers partners or communities of interest to an enterprise customer s network over a shared infrastructure using dedicated connections. Extranet VPNs differ from intranet VPNS in that they allow access to users outside the enterprise. This document focuses solely on access VPNs. Access VPNs The main attraction of access VPNs is the way they delegate responsibilities for the network. The enterprise customer outsources the responsibility for the information technology IT infrastructure to an Internet service provider ISP that maintains the modems that the remote users dial into called modem pools access servers and internetworking expertise. The enterprise customer is then only responsible for authenticating its users and maintaining its network. Instead of connecting directly to the enterprise network by using the expensive public switched telephone network PSTN access VPN users only need to use the PSTN to connect to the ISP s local point of

• Quản trị mạng
• Financial Activities
• Access VPNs
• Intranet VPNs
• VPN Architectures
• Enterprise Customers
• VPN Technologies
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