1. You can build the new server anytime. The name does not need to match the old server. In fact, it rarely would since you may need to run DMA at least twice so the old system would remain online until you migrate the data over.
2. You download DMA from Cisco.com. You need a CCO login to access it. You install it on the 4.2(3) server.
3. Yes, there is a procedure. This is one for 7.1(2) and it's pretty much the same for the newer DMA versions 7.1(3) and etc.
From what you are saying regarding your knowledge of DMA, I would highly suggest you read up on DMA and the migration process as a whole well in advance of doing any work with your customer's production system. Keep in mind that when you install DMA, you need to reboot the Publisher afterwards.
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