Two networks secure and insecure. Best option

Hello,
My scenario is the following:
I have two groups: one with about 50 workstations used by employees (payroll, pension, financial records), and another one used by students (25 PCs)who come and go (obviously insecure because people come from the outside all the time).

They are currently under one domain and one network. We are looking to upgrade them. What would be the best option? Two separate networks with separate DC, DNS, DHCP in each network? Please, let me know what other options could be and if this is the best solution.
claudiamcseAsked:
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Joseph MoodyConnect With a Mentor Blogger and wearer of all hats.Commented:
http://www.cisco.com/web/learning/netacad/index.html

Look in the bottom right for a course locator. It is mainly taught at local colleges.
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Joseph MoodyBlogger and wearer of all hats.Commented:
Same physical network. Use VLANs to separate them and access control list on your top router to keep traffic separate.
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claudiamcseAuthor Commented:
Can you put more info about VLANs and how to separate them. Is it secure? How long does it take to set it up the access controll list on the router for 20 student PCs?
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Joseph MoodyBlogger and wearer of all hats.Commented:
This is something that you will have to learn a bit about.

You may want to take a networking intro (like a CCNA course).

Here is a good book for you:

http://www.amazon.com/CCNA-Certified-Network-Associate-640-802/dp/0470110082/ref=sr_1_9?ie=UTF8&qid=1297701910&sr=8-9 

Once you understand the technologies and how the work, it wouldn't take you more than five minutes to set up. You just have to understand ACL orders, vlans, routing, etc.
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claudiamcseAuthor Commented:
Thank you so much. I will buy this book.
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Joseph MoodyBlogger and wearer of all hats.Commented:
No problem. If you get a chance, take a Cisco Networking Academy course. It will be the best 5 hours a week you spend!
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claudiamcseAuthor Commented:
Where is this course? Can you give me an info? I would be definitely interested in it.
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