In Kerberos authentication, what is a role of the Active Directory?

A.
Verifies the user’s login information
B.
Implements the Authentication service and Ticket Granting service
C.
Verifies the session ID when the client-server session is established
D.
Maintains the access control list in a keytab file
The right answer is B
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The right is A :
QUOTE Authentication requires verifying the identity of a network user and therefore involves a login credential lookup on a Network Information System (NIS) server in a UNIX environment. Similarly, a Windows client is authenticated by a Windows domain controller that houses the Active Directory QUOTE
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I agree with carmen. How to pass this tricky exam though..?
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A
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A.
Verifies the user’s login information
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I choose A
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Correct answer is B,
http://searchsecurity.techtarget.com/definition/Kerberos
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