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Calling all security pros: &nbsp;What are the requirements that make a DMZ a DMZ? &nbsp;If I stand up a server in a segmented network exposed to untrusted with only the ports open that are absolutely necessary? How is that any different than opening ports in the firewall to an internal server other than segmenting the server from other servers? <br />
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I know what a DMZ is but don't quite understand what are the different pieces that make a complete DMZ solution or DMZ best practices? &nbsp;Isolate from internal systems by doing more than just putting the server on it's own subnet? &nbsp;Is there specific firewall requirements that make it a 'DMZ' ? How is a DMZ different from an application zone?<br />
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Thanks in advance!!
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Calling all security pros:  What are the requirements that make a DMZ a DMZ?  If I stand up a server in a segmented network exposed to untrusted with only the ports open that are absolutely necessary? How is that any different than opening ports in the firewall to an internal server other than segmenting the server from other servers? 

I know what a DMZ is but don't quite understand what are the different pieces that make a complete DMZ solution or DMZ best practices?  Isolate from internal systems by doing more than just putting the server on it's own subnet?  Is there specific firewall requirements that make it a 'DMZ' ? How is a DMZ different from an application zone?

Thanks in advance!!

What is the difference between a DMZ and Zone?

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

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.