enforce password history
the number here indicate no of passwords which are that kept in the history. when a password is added to the history page it cannot be reassign until it released.
maximum password age
the no of days that the password can be kept at maximum indicated here. if a password is not changed within this duration its expired.
minimum password age
this means the no of days that a password must be kept before changing.
minimum password length
With this policy setting, you can assign a minimum number of characters for account passwords. The number can be anything from 0 to 14. It is generally recommended that passwords be a minimum of 7 or 8 characters to make them sufficiently secure.
maximum password length
this means the maximum characters you can put in for a password.
the maximum password length is 128 characters
password must meet complexity requirement
when this option is enabled the password must be consisted with lower and uppercase letters and numbers or alphabets,numbers and symbols.