Turn on any network tracing tool and watch what it's doing.
Don't use any Database Client, that would use network to access DB Server, don't use a Network Printer as your default printer. Or any third party communication app. that would use the network.
There may be one use, CR phones home for the Home page to be populated, I believe it uses Chrome engine to do this. But that is all handled by the dependencies, no specific calls into Network that I know of.
We are talking Standalone CR, if you are also using BOE or CR Server that's a different set of communications that directly access your network calls, I believe.
Curious why you are asking?
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