Linux+ Linux+ System Monitoring and Logging 2

Question 1

Which command displays real-time disk I/O statistics per process?

Accepted Answer

iotop

Answer

iotop shows real-time disk I/O usage per process, similar to how top shows CPU usage.

Question 2

In journald, which option to journalctl shows only kernel messages?

Accepted Answer

-k

Answer

The -k flag (short for --dmesg) filters journalctl output to show only kernel ring buffer messages.

Question 3

A sysadmin wants to monitor network bandwidth usage per interface in real time. Which tool is best suited?

Accepted Answer

nload

Answer

nload provides a real-time graphical display of network bandwidth usage per interface in the terminal.

Question 4

What does the 'wa' field represent in the output of the top command?

Accepted Answer

CPU time spent waiting for I/O

Answer

The 'wa' field in top shows the percentage of CPU time spent idle while waiting for I/O operations to complete.

Question 5

Which rsyslog directive sets the maximum log file size before rotation is triggered?

Accepted Answer

$outchannel with size limit

Answer

rsyslog's $outchannel directive can specify a size limit that triggers an action (such as rotation) when reached.

Linux Practice Test