This will show you the IP addresses / DNS names you can whitelist in your environment to prevent nu-authorized access to your data source from any other client.
There are few things to consider - remember Qlik access the data on load only - which is done on demand using a button in the data manager - or when scheduled. Once the data is loaded into the app - it becomes part of the app - and no longer has a live connection to the underlying source (unless reloaded)
So by whitelisting the IPs / DNS names you are preventing other outside access - and only allowing Qlik Sense Cloud to access that URL.
Let me know if you have any other questions.
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