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I think these kind of abstract/big picture data communication questions should be on-topic here. Such as the mentioned question about the OSI model.

I've been actively pushing for software.codidact.com not to accept embedded systems questions and refer such questions to this site instead, so that we don't end up with the same unfortunate overlap that SE had. 

This initiative has so far been well-received and so embedded systems questions are currently listed as off-topic on software.codidact.com. And data communication is rather intimately connected with embedded systems, so it would be awkward not to accept such questions here, as long as they have some design or engineering aspect.

Things like network administration and Internet Protocol Suite application tiers probably don't belong here though. They are more suited for either powerusers.codidact.com or software.codidact.com.