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Which of the following utilities can be used to monitor I/O activity? (We encourage you to try all of them, as this is the best way to learn)

• iotop

• vmstat

• sar

• iostat

Which of the following utilities can be used to monitor process and system load activity? (We encourage you to try all of them as this is the best way to learn)

• df

• ps

• free

• top

• uptime

Your system seems memory-starved and is slowing down. Which utilities would give you information about your memory usage?

• pstree

• vmstat

• pmap

• free

• netstat

Which statement is true?

• It is easier to monitor system activity using graphical interface tools, as they vary little from one Linux distribution to the next.

• It is easier to monitor system activity using command line tools, since they vary little from one Linux distribution to the next.

Which are high level graphical system monitoring tools?

• ksysguard

• wireshark

• gnome-system-monitor

• Network Manager

Which statements are true?

• It is possible to unload a kernel module being used by an application if you use the -f option to either rmmod or modprobe -r

• It is impossible to unload a kernel module being used by an application.

• It is possible to unload a kernel module being used by another module if you use the -f option to either rmmod or modprobe -r

• It is impossible to unload a kernel module being used by another module

The lsmod utility shows for each loaded module (select all correct answers):

• When the module was loaded

• How many processes depend on it

• What other modules are using it

• Its size in bytes

• Which user loaded the module

Udev (select all correct answers):

• Is designed to control which users can use a particular device

• Loads and unloads device drivers and other kernel modules as needed

• Is responsible for populating the /dev directory once the system is up and running

• Stands for User Device

• Stands for Deviant User

Which command will ensure the httpd service (Apache) starts at system boot?

• sudo systemctl enable httpd.service

• sudo systemctl status httpd.service

• sudo systemctl start httpd.service

• sudo systemctl init httpd.service

How could you ensure the httpd service (Apache) is restarted if it is already running, say to absorb a revised configuration file (select all correct answers)?

• sudo restart httpd

• sudo systemctl restart httpd

• sudo systemctl stop httpd && sudo systemctl start httpd

• sudo killall httpd && sudo startall httpd