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==Associated Protocols==
Although not required, NAS are almost exclusively used with AAA servers. Of the AAA protocols available, RADIUS tends to be the most widely used. The [[Diameter (protocol)|Diameter]] base protocol extends RADIUS services by providing error handling and inter-___domain communications. This protocol is used in networks like [[IP Multimedia Subsystem]] (IMS).
==Access Servers In Practice==
Access servers are specialized routers handling voice, data, fax, and video traffic, that emerged principally beginning with the internet. A number of companies have developed access server product lines, including Cisco, USR/3Com, Lucent, Avaya, Patton, Juniper, and others. The explosive development of internet based networking fostered the IP versions of many forms of communications. For example, voice telephone calls, which traditionally were handled with dedicated telecommunications cabling, increasingly were converted to voice over IP traffic (VOIP) and run over the internet. Access server applications continue to proliferate; while the began with dialup internet and developed into VOIP phone calling, they are now entering into video streaming, and companies such as Netflix, Youtube, and a variety of other companies are presently developing content designed to be streamed over the internet. [http://www.isptrader.com/content/introduction-access-servers Use this source for a review of the development and characteristics of access servers].
{{DEFAULTSORT:Network Access Server}}
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