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A device for making a substance stronger or purer.
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Remote access concentrators are more than just modem banks, they accept connection from a wide range of network types, such as ISDN, telephone, ATM, Frame Relay and leased lines.
A number of major network equipment suppliers recently announced a new generation of multi-service remote access concentrators that they refer to as "carrier class.
This new version of the Cisco NAC appliance also includes single sign-on capabilities with both the Cisco ASA 5500 series and Cisco VPN 3000 series remote access concentrators which extends network admission control to remote access users without complicating the user experience.