All that is needed to provide communication between two VLANs is a DHCP relay agent.

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A DHCP relay agent is used to forward DHCP requests from one network segment to another where a DHCP server is located. While it can assist with assigning IP addresses to devices on different VLANs, it is not sufficient to provide communication between the VLANs themselves, since VLANs are separate broadcast domains. To allow communication between VLANs, a device such as a router or layer 3 switch is needed to route traffic between the VLANs.

All That Is Needed to Provide Communication Between Two VLANs