Which of following is not a service provided by AAA servers (Radius, TACACS and DIAMETER)? 

Answer options:

A. Authentication
B. Administration
C. Accounting
D. Authorization

B

Radius, TACACS and DIAMETER are classified as authentication, authorization, and accounting (AAA) servers. Source: TIPTON, Harold
F. & KRAUSE, MICKI, Information Security Management Handbook, 4th Edition, Volume 2, 2001, CRC Press, NY, Page 33. also see: The term "AAA" is often used, describing cornerstone concepts [of the AIC triad] Authentication, Authorization, and Accountability.Left out of the AAA acronym is Identification which is required before the three "A`s" can follow. Identity is a claim, Authentication proves an identity, Authorization describes the action you can perform on a system once you have been identified and authenticated, and accountability holds users accountable for their actions. Reference:CISSP Study Guide, Conrad Misenar, Feldman p. 10-11, (c) 2010 Elsevier.