Abbreviated as NAS, a network access server is an
access gateway between an external
communicationsnetwork
and an internal network. A common use of NAS is by Internet service providers
(ISP) where the user dials into the ISP and is given
access to the Internet after being authorized by the
access server. Network access server (NAS) is also referred to as a
remote access server (RAS) or as a media
gateway. The IETF Network Access Server Requirements
Working Group is responsible for defining the requirements for modern network
access servers.
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