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Routing VLANs to Firewall Ports

Your current topology is exactly as it should be. You don’t need layer 3 switch functions. You don’t add complexity just because it’s a waste of it’s power.
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VLAN and firewall interconnection

You haven't specified which kind of firewall you're using, so we can only provide general advice. You can either use a separate connection for each VLAN between the central switch and the firewall - ...
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-1 votes

Is it best practice to restrict access from non-DMZ hosts to DMZ hosts?

Best practice according to Google is that there is no trusted zone, or network. There is no DMZ. None. No network is trusted, or partially trusted. What is BeyondCorp? BeyondCorp is Google's ...
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Is it best practice to restrict access from non-DMZ hosts to DMZ hosts?

Security zones are usually categorized by their security level (=their need for protection). The basic rule about inter-zone communication is that you often permit higher-security hosts access to ...
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Is it best practice to restrict access from non-DMZ hosts to DMZ hosts?

There is no one answer to your question. Whether it's "OK" depends on your risk tolerance, your relative vulnerability, and the sensitivity of your assets. Only you can answer that question....
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What is the difference between having a firewall inside vs outside the network?

Deployment of firewalls is purely depends upon network design and according to business requirements . But basically firewalls deployed on perimeter level where firewall is exposed to internet traffic ...
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