1z0-100 Exam Dumps | Which statement correctly describes the requisite PAMcontrol flag? (Choose the best answer.)

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Question 38/140

Which statement correctly describes the requisite PAMcontrol flag? (Choose the best answer.)

A. requisiteflagged modules are ignored if they fail

B. requisite flagged modules must be successfully checked for authentication to succeed. If a requisite module checks fails, the user is notified immediately with a message reflecting the first failed requiredor requisite module

C. requisiteitems only play a role when no other modules of that module type have succeeded or failed. In that case, the success or failure of a requisite flagged module determines the overall PAM authentication for that module type

D. requisite flagged modules must be successfully checked for authentication to succeed. If a requisite module checks fails, the user is not notified until all other modules of the same module's type have been checked

Correct Answer: B

Explanation/Reference:
Explanation:
Four types of control flags are defined by the PAM standard:
required - the module must be successfully checked in order to allow authentication. If

a required module check fails, the user is not notified until all other modules of the same module type have been checked.
requisite - the module must be successfully checked in order for the authentication to be successful.

However, if a requisite module check fails, the user is notified immediately with a message reflecting the first failed required or requisite module.
sufficient - the module checks are ignored if it fails. But, if a sufficient flagged module is successfully

checked and no required flagged modules above it have failed, then no other modules of this module type are checked and the user is authenticated.
optional - the module checks are ignored if it fails. If the module check is successful, it does not play a

role in the overall success or failure for that module type. The only time a module flagged as optional is necessary for successful authentication is when no other modules of that type have succeeded or failed. In this case, an optional module determines the overall PAM authentication for that module type.
Reference: http://www.unix-info.org/RH_Guid.80/rhl-rg-en-8.0/s1-pam-control-flags.html

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