Need some advise on Multi-role server as a backup

Hi,
I am very new to Exchange 2013 deployment. So please excuse me if my terminology is not correct.
My scenario is as such, I want to Split the CAS and the MBX roles for exchange into 2 separate servers. Let's call them MBX1 and CAS1
Then, I want to have a 3rd, high-end server which would be part of the DAG and hold a copy of the MBX1 server's database. Also, I want this server to act as a CAS as well, but only if the original is down.
So I read in the forums about how DAG works so my question is can a Multi-Role server be part of the DAG for MBX1? Can the same server also take over the CAS role only if CAS1 is down? How can I configure it to behave in this fashion?
The deployment will also have a new AD server, currently there is no AD. So i am thinking of my overall architecture how it will function.
I appreciate your comments and feedback!

Hi 
Here are the answers
So I read in the forums about how DAG works so my question is can a Multi-Role server be
part of the DAG for MBX1?
Yes multirole servers can be a part of DAG 
Can the same server also take over the CAS role only if CAS1 is down? How can I configure
it to behave in this fashion
Yes they also can function as CAS servers 
The deployment will also have a new AD server, currently there is no AD. So i am thinking
of my overall architecture how it will function.
Its always recommended to have a DC installed separately
For CAS high availability you can have 
2 or more individual CAS servers together in a hardware or software LB
for mailbox High availability you can have 
3 or more mailbox servers combined together in a DAG in a same data-center or different data-center 
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

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    Once they get the shutdown issues fixed, I think it'll be worth what I paid for it, but it's definitely frustrating. Don't lose faith in Apple. This kind of thing happens to everyone, but I sure do wish I had put off my MacBook purchase.
    I was supposed to have my logic board replaced on Monday, but guess what? The replacement logic board was defective.
    Ahhhhhhhhhhhhhhhhhhhhhhhhhrrrrrrrgggghhhhh!
    I swear, all I want is a public admission by Apple that they screwed up with some of the first MacBooks. Seriously. Everyone makes mistakes, and electronics can't always be perfect out of the box. I know that. I just the psychological satisfaction that will come with an admission on their part.
    It happened with the discoloration. I went into an Apple store with my "PinkBook" in early June, and they said it was obviously my fault. I can't wait to go back there and ask them how many stained MacBooks they've seen.
    CrapBook...I mean MacBook (1 gig RAM; 120 gig HD); 20" iMac Core Duo (1 gig RAM; 250 gig HD) Mac OS X (10.4.7)

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