A user has been locked out of an account due to too many failed password attempts.
Which of the following commands will unlock the user's account?
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A. B. C. D.A.
https://www.tecmint.com/use-pam_tally2-to-lock-and-unlock-ssh-failed-login-attempts/The correct answer is A. pam_tally2 --user=user --reset.
Explanation: When a user enters an incorrect password multiple times, their account may become locked as a security measure. To unlock the account, we need to use the appropriate command. Here's what each command does:
A. pam_tally2 --user=user --reset: This command resets the failed login count for a specified user (in this case, "user") back to 0, effectively unlocking the account. The "pam_tally2" module is used to keep track of failed login attempts.
B. passwd -u user -G root: This command is used to unlock a password-protected user account. The "-u" option unlocks the account and the "-G" option changes the user's primary group to "root".
C. usermod -u user -G root: This command is used to modify a user account. The "-u" option changes the UID (user ID) of the user, and the "-G" option changes the user's primary group to "root". However, this command does not unlock a locked account.
D. chage -1 user=user --reset: This command changes the password aging information for a user account. The "-1" option sets the password to never expire. The "--reset" option resets the number of days since the password was last changed. However, this command does not unlock a locked account.
Therefore, the correct answer is A. pam_tally2 --user=user --reset.