The following output shows an excerpt from a standard network configuration file:

time 37/udp timeserver
rlp 39/udp
name 42/udp nameserver
whois 43/tcp nickname

Which file could this be from?

Which two of the following Class B IPv4 networks are reserved by IANA for private address assignment and private routing?

(Choose two)

You discover a pending job for the at command.

Which of the following do you have to use to remove it?

On a system using shadowed passwords, the correct permissions for /etc/passwd are _____ and the correct permission for /etc/shadow are _____.

Which of the statements is the result of the following command?

$ export PS2="[uw]\$ "

You have modified user bob’s login information. In the passwd file, you changed /bin/bash to /bin/false. What effect will this have on user bob?

You have a script called logout-users which will log out inactive users every hour between the hours of 6 p.m and 7 a.m., Monday through Friday.

Choose the best option for a crontab entry:

Which crontab entry could be used to set the system time at regular intervals?

Which of the following are elements of good password practice for users?

(Choose THREE)

Which of the following commands will lock the user foobar’s account?