Which of the following utilities can be used in Linux to view a list of users’ failed authentication attempts?

A.
badlog

B.
faillog

C.
wronglog

D.
killlog

Explanation:
var/log/faillog – This Linux log fi le contains failed user logins. You’ll find this log useful when tracking
attempts to crack into your system.
/var/log/apport.log This log records application crashes. Sometimes these can reveal attempts to
compromise the system or the presence of a virus or spyware.
Incorrect Answers:
A, C, D: These are not files that can be found under the /var/log Directory as used in Linux.

http://www.thegeekstuff.com/2011/08/linux-var-log-files/
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, p. 47