Exchange 2010 DAGs

I have this scenario and cannot find an answer. Please help.

I have 2 locations A and B seperated by a WAN. Each site will contain 1 Exchange 2010 server that will replicate a single database. I understand a DAG will need to be created with a Witness server. The problem is where do you place the witness server as if the WAN goes down between the sites then according to what i have read the site without the witness server database will go offline until a witness server is found. Is that right? if so that means you would have to replicate the witness server as well! Is there something I have missed?
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In a two node DAG like your setup you need an alternate witness server setup. You can pre-poulate this with the shell.

See - AlternateWitnessServer

Set-DatabaseAvailabilityGroup -Identity DAG1 -AlternateWitnessDirectory C:\DAGFileShareWitnesses\ -AlternateWitnessServer EXHUB3

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