Which of the following commands lists all defined variables and functions within Bash?

A. env

B. set

C. env -a

D. echo $ENV

Where are user specific crontabs stored?

A. In the database file /etc/crontab.db which is shared by all users.

B. As individual per-user files within /var/spool/cron.

C. As individual per-user files in /etc/cron.user.d.

D. In the .crontab file in the user's home directory.

E. In the file /var/cron/user-crontab which is shared by all users.

Why should an NTP client maintain connections to several NTP servers?

A. To receive NTP information every second as each server transmits NTP pings every five seconds only.

B. To improve the precision of the time by comparing responses from several servers.

C. To not overload the remote server in case the local NTP time cache is not enabled.

D. To not lose contact with all NTP servers in case the client changes networks.

What is true regarding the time in a Linux system?

A. The BIOS clock of a computer always indicates the current local time and time zone.

B. Each application must convert the Unix time to the current time zone which is usually done by using standard libraries.

C. When the system is on the network, each query for the current time lead to a new network connection to a time server.

D. When the system time changes, running processes must be restarted in order to get the correct time.

Which of the following programs can be used to determine the routing path to a given destination?

A. dig

B. netstat

C. ping

D. route

E. traceroute