The variable COUNT FIELDS (Y Field) counts the appearance of a specific field in the capture file, or in information filtered by a filter configured in the display filter column.

The principle of this is as follows:

• In the Display filter columns, you configure a filter to the traffic that should be checked
• In the Y Axis column, you configure COUNT FIELDS (Y Field)
• In the Y Field column, you specify the field whose appearances you want to count

In the following screenshot (file CAP_1674_06_11), you see an example of how it is used:

Here, we can see that we checked the number of appearances of A records and AAAA records: the upper graph is for the IPv4 A records, and the lower graph is for the IPv6 AAAA records.