DFS Server Costing

Hello,
     We use DFS to replicate data from servers on one site to servers on another etc...

Here's my Question: We have two servers, both on the same site replicating to one another, as both are senders.

I understand site cost, but if the servers are on the same site - How does DFS determine which server to go to?

Thanks for any help,
anthonyrsc

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