Enabling Inter-VLAN Connectivity
Question
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?
Answers
Explanations
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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 Local Area Networks) are used to segment a network into smaller logical broadcast domains. When hosts are on the same VLAN, they can communicate with each other without the need for a router, as they are all in the same broadcast domain. However, when hosts are on different VLANs, a router is required to facilitate communication between them.
Option A is the correct answer because a router with subinterfaces configured on the physical interface that is connected to the switch allows for inter-VLAN communication. Subinterfaces are virtual interfaces that allow a single physical interface on a router to be divided into multiple logical interfaces. Each subinterface can be configured with an IP address and associated with a specific VLAN. When a host on one VLAN needs to communicate with a host on another VLAN, the router uses its subinterfaces to route the traffic between the VLANs.
Option B is incorrect because a router with only an IP address on the physical interface connected to the switch cannot facilitate inter-VLAN communication. The physical interface can only be associated with one VLAN, and therefore, hosts on different VLANs cannot communicate with each other.
Option C is incorrect because an access link is used to connect an end device (such as a host) to a switch port configured for a specific VLAN. It does not facilitate inter-VLAN communication.
Option D is also incorrect because a trunk link is used to carry traffic for multiple VLANs between switches. It does not facilitate inter-VLAN communication on its own. A router with subinterfaces is still required to route traffic between the VLANs.
In summary, inter-VLAN communication can be facilitated by a router with subinterfaces configured on the physical interface that is connected to the switch.
