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The strategy you outline is a common one and allows network communications to be carefully controlled at a single point; however, it also poses some challenges. First, it increases network latency (which will be noticeable to users) by forcing all of their traffic through the central office. Second, it creates a single point of failure. If the central office loses network connectivity, the remote office will go down as well. This isn't a great topology, especially if you consider the remote office a potential backup site for the central office.
I'd suggest establishing an Internet connection at both offices and using VPN technology to create a secure tunnel between the two for interoffice communication. Supplement that with similarly configured firewalls and content filtering at both locations. That strategy should adequately secure both sites without the drawbacks identified above.
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