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Since finance is involved, you should be consulting a networking/security firm before plugging in to internet.From your question it's evident that you may not be aware of all the networking aspects. It will carry a great deal of risk(for your finance dept and business) if you try to do it yourself without any professional audit/consultation.<br />
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Depending on the sensitivity of finance division you will need a thorough checking of the Desktops, patching of OS and softwares, implement extra security at the firewall, enable strict user control(windows domain) etc.<br />
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The last thing you need will be someone seeing your business finance data sitting in his basement garage (and probably trying to sell it). :)<br />
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Best,
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Since finance is involved, you should be consulting a networking/security firm before plugging in to internet.From your question it's evident that you may not be aware of all the networking aspects. It will carry a great deal of risk(for your finance dept and business) if you try to do it yourself without any professional audit/consultation.

Depending on the sensitivity of finance division you will need a thorough checking of the Desktops, patching of OS and softwares, implement extra security at the firewall, enable strict user control(windows domain) etc.

The last thing you need will be someone seeing your business finance data sitting in his basement garage (and probably trying to sell it). :)

Best,

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History<br />
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Currently our company have two isolate network ,One is for finance department and another is for normal LAN.In the first place ,management decide to split the network to two different network due to security issue .But now management has decide to allow finance department to access DMZ resource and browser internet.Please advice how to connect this two network together.Thank you<br />
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<a href="https://filedb.experts-exchange.com/incoming/2013/06_w26/663201/RSP-Network-Diagram-Study.jpg" target="_blank" title="Company Network (44 KB)"><img alt="Company Network" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2013/06_w26/800_663201/RSP-Network-Diagram-Study.jpg" /></a>
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RSP-Network-Diagram-Study.jpg

History
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Currently our company have two isolate network ,One is for finance department and another is for normal LAN.In the first place ,management decide to split the network to two different network due to security issue .But now management has decide to allow finance department to access DMZ resource and browser internet.Please advice how to connect this two network together.Thank you









How to connect two network together

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.