Router on a Stick

D

A router on a stick is a technique that allows a router to handle traffic from multiple VLANs using a single physical interface. It accomplishes this by using subinterfaces, which are virtual interfaces that share the physical interface of the router. Each subinterface is assigned to a specific VLAN, allowing the router to communicate with multiple VLANs.

Answer D is correct. A router on a stick uses multiple subinterfaces of a single interface to encapsulate traffic for different VLANs. Each subinterface is assigned a unique VLAN ID, and the router uses that VLAN ID to tag traffic as it moves between the subinterfaces.

Answer A is incorrect. A router on a stick does not necessarily involve multiple switches. It is a technique that can be used on a single switch or across multiple switches.

Answer B is incorrect. A router on a stick does not use multiple subinterfaces of a single interface to encapsulate traffic for different VLANs on the same subnet. Each subinterface is assigned to a different VLAN, which typically corresponds to a different subnet.

Answer C is incorrect. A router on a stick does not require the native VLAN to be disabled. The native VLAN is used for untagged traffic on a trunk port, and it can be configured to work with a router on a stick configuration.