Does the DMZ area not pass through the core switch

DMZ traffic can pass through the core switch, but best practice is to route it through firewalls for security, not necessarily bypassing the core switch.DMZ OverviewA DMZ is a network segment that isolates public-facing services from the internal LAN, providing a buffer between untrusted networks (like the Internet) and trusted internal resources. Its main purpose is to allow controlled access to external users while protecting internal systems. DMZ servers are accessible from both internal and external networks, but access is tightly controlled via firewalls and ACLs (Access Control Lists) to prevent unauthorized access to the internal network .Core Switch RoleThe core switch primarily handles high-speed routing and inter-VLAN traffic within the internal network. In some designs, DMZ traffic may traverse the core switch, especially if the DMZ is logically connected via VLANs on the internal network. For example, in a scenario where a web proxy or security appliance (like a WSA) is connected to the internal firewall through the core switch, traffic flows from clients → core switch → internal firewall → DMZ device → external firewall → Internet . This setup is common when the internal firewall serves as the default gateway for internal clients.Security ConsiderationsWhile DMZ traffic can pass through the core switch, security best practices emphasize that all DMZ traffic should be filtered by firewalls. The DMZ should not be treated as part of the internal trusted network. Using VLANs on internal switches can provide logical segmentation, but dedicated external DMZ switches are preferred for stronger isolation and reduced risk of lateral movement if a DMZ host is compromised . Firewalls enforce access policies, and IDS/IPS systems can monitor DMZ traffic for suspicious activity.SummaryDMZ traffic does not have to bypass the core switch, but it should always pass through firewalls to enforce security policies.Logical VLAN segmentation on internal switches is acceptable for small deployments, but dedicated DMZ switches improve isolation.The core switch is mainly for internal routing, not for enforcing DMZ security; firewalls and ACLs define the actual security boundaries . In conclusion, while DMZ traffic can traverse the core switch, the critical factor is firewall enforcement and proper segmentation, not whether the core switch is bypassed.