Which inter-VLAN routing method involves a router with separate physical interfaces connected to access ports in different VLANs?

Traditional inter-VLAN routing involves the use of a router with multiple physical interfaces, each one connected to a switch port that is assigned to a different VLAN. This setup requires that the router has a physical port for each VLAN so that it can route traffic between them. This method effectively allows the router to receive traffic from one VLAN, process it, and then forward it to another VLAN through its different physical interfaces.

In this scenario, each interface on the router is assigned an IP address that corresponds to the subnet of the VLAN it is servicing. This means that devices within those VLANs can communicate with each other through the router by using the respective subnet IP addresses when sending packets.

This method is distinct from the other options. In contrast, router-on-a-stick involves a single router interface that is configured with sub-interfaces for each VLAN and uses VLAN tagging to manage inter-VLAN traffic through a trunk link. Layer 3 switching refers to the capability of certain switches to perform routing functions without needing a separate router, whereas Dynamic ARP Inspection is a security feature that helps prevent ARP spoofing attacks. Each of these methods serves different purposes in network design and architecture.