Virtual Private Network (VPN)

A VPN (virtual private network) is a private network constructed within a public network infrastructure, such as the global Internet. Businesses can use a VPN to securely connect remote offices and remote users using cost-effective, third-party Internet access, instead of expensive, dedicated WAN links or long-distance remote dial links.

Organizations can use a VPN to reduce WAN bandwidth costs, while increasing connectivity speeds by using high-bandwidth Internet connectivity, such as DSL, Ethernet, or cable.

A VPN provides the highest possible level of security through encrypted IP Security (IPsec) or Secure Sockets Layer (SSL) VPN tunnels and authentication technologies. These protect data traversing the VPN from unauthorized access. Companies can take advantage of the easy-to-provision Internet infrastructure of the VPN to quickly add new sites or users. They can also dramatically increase VPN reach without significantly expanding infrastructure.

A VPN Extends Security for Remote Users

An SSL VPN and an IPsec VPN have become the primary VPN solutions for connecting remote offices, remote users, and business partners, because they:

• Provide secure communications with access rights tailored to individual users, such as employees, contractors, or partners
• Enhance productivity by extending corporate network and applications
• Reduce communications costs and increases flexibility

The two types of encrypted VPNs are:

• Site-to-Site IPsec VPN: This alternative to Frame Relay or leased-line WANs allows businesses to extend network resources to branch offices, home offices, and business partner sites.
• Remote-Access VPN: This extends almost any data, voice, or video application to the remote desktop, emulating the main office desktop. A remote-access VPN may be deployed using SSL VPN, IPsec or both, depending on deployment requirements.

 

For more information please visit: Cisco ASA 5500 Series Adaptive Security Appliances