I'm not sure where you're seeing 5 year old information, this document is regularly updated, https://docs.splunk.com/Documentation/Splunk/latest/Data/WhatSplunkcanmonitor and gives a very thorough explanation of what and how to gather data. If you are after Network sources specifically, you should refer to https://docs.splunk.com/Documentation/Splunk/latest/Data/Monitornetworkports If you have a particular technology you are monitoring (for example, Cisco Switches), you should search https://splunkbase.splunk.com to see if there is an existing Add-On for gathering your data. ... View more