Distribution of Release Bundle to artifactory edge node is checksum based

I want to understand when distribution of release bundle is triggered from source artifactory to artifactory edge node. Is it check sum based? Will source artifactory send checksum based headers first to the edge node or duplicate artifacts will also go over the wire? Reason for understanding is if my release bundle is in GB's and I am distributing some common files again & again as part of different bundles how artifactory will optimise the transport of these common files across different bundles??

Like what I understood from the below link that replication is checksum based. Source artifactory first sends checksum based headers. Is this true for distribution of release bundle as well?

https://www.jfrog.com/confluence/display/JFROG/Repository+Replication

And there is one document link regarding distribution 

https://www.jfrog.com/confluence/display/JFROG/Distributing+Release+Bundles#DistributingReleaseBundles-DistributingaReleaseBundle

which says that

"Distribution is responsible for triggering the replication process that happens from the source Artifactory to the Edge Nodes. First, it replicates the Release Bundle info to each Edge Node, and then initiates the replication process in the source Artifactory."

First it replicates the Release Bundle Info. What does that mean ?? What is there in the Release Bundle Info ??

 Will source artifactory will first send checksum based headers

I am looking for documentation on this. But I could not find concrete explanation anywhere.