AD client utilizing network bandwidth more than 200 mb per day,

Hi Guys,

We have more than 20 location, our 3 dc are located in Datacenter. From every site there are 5-6 systems utilizing network bandwidth towards DC's on 445 port. For this month, network utilization for banches toward DC is more than 6 GB. This is really heating us. Can anybody suggest what could be the cause.

Thanks,

Vikram