VPN concentrators incorporate the most advanced encryption and authentication techniques available. They are built specifically for creating a remote-access or site-to-site VPN and ideally are deployed where the requirement is for a single device to handle a very large number of VPN tunnels. They were specifically developed to address the requirement for a purpose-built, remote-access VPN device. For example Cisco VPN concentrators provide high availability, high performance and scalability and include components, called Scalable Encryption Processing (SEP) modules, that enable users to easily increase capacity and throughput. The concentrators are able to support small businesses with 100 or fewer remote-access users to large enterprise organizations with up to 10,000 simultaneous remote users.
This was first published in November 2006