Computers, Cisco CCNP Certification Exam Tutorial: Knowing RADIUS and TACACS+ For Your ISCW Exam
It's more than likely that you'll be using a server configured for one of the following security protocols:
TACACS+, a Cisco-proprietary, TCP-based protocol
RADIUS, an open-standard, UDP-based protocol originally developed by the IETF
An obvious question is "If there's a TACACS+, what about TACACS?" TACACS was the original version of this protocol and is rarely used today.
Before performing AAA Authentication configuration, there are some other TACACS+ / RADIUS differences you should be aware of:
While TACACS+ encrypts the entire packet, RADIUS encrypts only the password in the initial client-server packet.
RADIUS actually combines the authentication and authorization processes, making it very difficult to run one but not the other.
TACACS+ considers Authentication, Authorization, and Accounting to be separate processes. This allows another method of authentication to be used (Kerberos, for example), while still using TACACS+ for authorization and accounting.
RADIUS does not support the Novell Async Services Interface (NASI) protocol, the NetBIOS Frame Protocol Control protocol, X.25 Packet Assembler / Disassembler (PAD), or the AppleTalk Remote Access Protocol (ARA or ARAP). TACACS+ supports all of these.
RADIUS implementations from different vendors may not work well together, or at all.
RADIUS can't control the authorization level of users, but TACACS+ can.
We'll discuss the uses of both of these protocols in a future CCNP certification tutorial! Look for more CCNA, CCENT, and CCNP tutorials right here on this same website!
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of free CCNP certification and CCNA certification tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
Visit his blog, which is updated several times daily with new Cisco certification articles, free tutorials, and daily CCNA / CCNP exam questions!
A free 7-part course, "How To Pass The CCNA", is also available.
Pass the ISCW exam with The Bryant Advantage!
Related Tags: certification, exam, ccna, ccnp, password, differences, username, iscw, authentication, aaa, radius, tacacs
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