On a corporate network, hosts on the same VLAN can communicate with each other, but they are unable to communicate with hosts on different VLANs.
What is needed to allow communication between the VLANs?
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A. B. C. D.A.
Different VLANs can't communicate with each other, they can communicate with the help of Layer3 router.
Hence, it is needed to connect a router to a switch, then make the sub-interface on the router to connect to the switch, establishing Trunking links to achieve communications of devices which belong to different VLANs.
The correct answer is A, a router with subinterfaces configured on the physical interface that is connected to the switch.
VLANs (Virtual LANs) are used to segment a physical network into logical broadcast domains. When hosts are in the same VLAN, they can communicate with each other because they are on the same broadcast domain. However, if hosts are in different VLANs, they cannot communicate with each other by default. This is because VLANs are separate broadcast domains, and broadcasts are not forwarded between them.
To allow communication between VLANs, you need to use a Layer 3 device, such as a router, to route traffic between the VLANs. There are two common ways to configure a router to perform inter-VLAN routing:
Router on a Stick: In this configuration, a router is connected to a switch using a trunk link, and the router interface connected to the switch is configured as a subinterface, with each subinterface assigned to a different VLAN. The router then uses subinterfaces to route traffic between the VLANs.
Layer 3 Switch: A Layer 3 switch is a switch that has the ability to perform routing functions. In this configuration, the Layer 3 switch is configured with a virtual interface for each VLAN, and the switch uses the virtual interfaces to route traffic between the VLANs.
Option A is the correct answer because it describes the Router on a Stick configuration. The router would need to have subinterfaces configured on the physical interface that is connected to the switch. Each subinterface would be assigned to a different VLAN, and the router would use the subinterfaces to route traffic between the VLANs.
Option B is incorrect because a router with an IP address on the physical interface connected to the switch would only allow hosts in the same VLAN to communicate with the router. It would not allow communication between VLANs.
Option C is incorrect because an access link is a link that carries traffic for a single VLAN, and it does not allow communication between VLANs.
Option D is incorrect because a trunk link is used to carry traffic for multiple VLANs between switches, but it does not allow communication between VLANs on its own.