Which technology can enable multiple VLANs to communicate with one another?
The correct answer is A. inter-VLAN routing using a Layer 3 switch.
A VLAN (Virtual Local Area Network) is a logical grouping of network devices, such as computers, servers, and printers, that are not physically located on the same network segment but can communicate as if they are. By default, devices within a VLAN can communicate with each other, but devices in different VLANs cannot communicate with each other.
To enable communication between devices in different VLANs, you need to use a routing device, such as a router or a Layer 3 switch. Inter-VLAN routing is the process of forwarding traffic between VLANs using a routing device.
Option A: Inter-VLAN routing using a Layer 3 switch
A Layer 3 switch is a network device that combines the functions of a switch and a router. It operates at Layer 3 of the OSI model and can perform routing functions between VLANs. By configuring the Layer 3 switch with multiple IP subnets corresponding to different VLANs, the switch can route traffic between the VLANs, allowing devices in different VLANs to communicate with each other.
Option B: Inter-VLAN routing using a Layer 2 switch
A Layer 2 switch operates at Layer 2 of the OSI model and does not have the capability to perform routing functions. Therefore, it cannot enable communication between devices in different VLANs.
Option C: Intra-VLAN routing using router on a stick
Intra-VLAN routing refers to the process of forwarding traffic within the same VLAN. Router on a stick is a configuration where a single physical interface on a router is used to connect to a switch, and multiple logical interfaces are created on the router to correspond to different VLANs. This configuration allows the router to perform intra-VLAN routing between devices within the same VLAN, but it does not enable inter-VLAN routing between devices in different VLANs.
Option D: Intra-VLAN routing using a Layer 3 switch
This option is incorrect as it refers to intra-VLAN routing, which is the process of forwarding traffic within the same VLAN. A Layer 3 switch can perform both intra-VLAN and inter-VLAN routing, but the correct option for enabling communication between multiple VLANs is inter-VLAN routing using a Layer 3 switch.