Using "sub-domains" in Wordpress Multisite, will this work with Cloudfare?

Hey guys, I also have another question regarding in a similar form to my last one I it is:

I would like all my sites created on my multisite to have CDN access from Cloudfare...
so when using "sub-domains" as the new sites link, will this integrate with the free plan from Cloudfare. If so, can someone show me how,
or if I already have Cloudfare on the Network Domain will that automatically provide the CDN to any sites created under that Multisite?