Understanding Authentication Services

Authentication services are the implementation of the technology in question. For this part of exam study, the focus is on LDAP and Kerberos, though many other possibilities exist, such as Internet Authentication Service (IAS) and Central Authentication Service (CAS), which are outside the scope of this exam. Single sign-on initiatives round out the discussion in this section.


Lightweight Directory Access Protocol (LDAP) is a standardized directory access protocol that allows queries to be made of directories (specifically, pared-down X.500-based directories). If a directory service supports LDAP, you can query that directory with an LDAP client, but it’s LDAP that is growing in popularity and is being ...

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