By default, what value does the fillnull command replace null values with?

The fillnull command in Splunk is used to replace null values in your search results. By default, it replaces these null values with a zero (0). This is particularly useful when you are performing calculations or aggregations, as having a non-null value like zero can prevent errors or unexpected results in your analysis. The default behavior can be modified if needed, but the standard setting ensures that null values do not disrupt data integrity, allowing for seamless calculation and visualization.

In contrast, the other options reflect possible values that could be used to replace nulls under different circumstances or custom configurations. However, in its standard implementation, fillnull’s default action is to replace null values with 0. This reinforces the importance of understanding how default commands and their configurations operate within Splunk to effectively prepare and analyze data.