what is a difference between EMS IPs as Target and EMS IPs as source, though for whitelisting we need to give EMS IPs as target. Please refer to the image attached

Target: when you need to connect FROM the customer to EMS - i.e. extractor

Source: when you need to connect from EMS to the customer - i.e. Action Flow invoking a Webservice in customer premises.

BTW, Machine Learning workbench has it's own sets of from and source targets. It is not common, but you could need it

HTH

Thanks a lot!!