December 2006
Intermediate to advanced
1188 pages
72h 8m
English
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Introduction
The Terminal Access Controller Access Control System (TACACS) protocol dates back to an earlier era in networking when terminal servers were common. The terminal server was also called a Terminal Access Controller (TAC). So TACACS was the TAC Access Control System.
The TACACS protocol was developed in the early 1980s by a company called BBN, which played a key role in the early development of the Internet (parts of BBN were subsequently absorbed by companies such as Verizon and Cisco). The original protocol only included basic functionality to forward login credentials to a central server, and the ability for the server to respond with a pass or fail on those credentials.
Cisco implemented several extensions to the original TACACS protocol in 1990, and called the new version XTACACS (Extended TACACS), which is described in RFC 1492. However, the IETF considers this RFC to be purely informational, and not an official protocol specification.
More recently, Cisco has replaced both of these earlier versions of TACACS by a newer implementation called TACACS+. The three different versions are not compatible with one another. In fact, Cisco considers the two earlier versions to be obsolete and no longer supports them, although they are still included in the IOS for backward compatibility reasons. This chapter will focus on only the newest TACACS+ version. There is no RFC protocol specification for TACACS+.
It is important to remember that TACACS+ is a Cisco proprietary standard, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.