Bandwidth Question with 2 Machines

There are many suguestion on this forum to have 2 machines, 1 run MySQL and 1 runing the website such as vBulletin to share the work load.

Each dedicated machine is allowed a number of GB/month transfer. With this 2 machines model, how does the bandwith is calculated? Will all the bandwidth counted toward the web server machine since it request data from Mysql server before in change give it to users? Or is that the data from database transfer straight to users so that bandwidth do not count toward the server?

Please help me understand.

 

 

 

 

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