AP Networking Practice Test

Inter-VLAN routing refers to routing traffic between different VLANs. Which device commonly performs this routing?

It is done by the end-user device. It is done by a firewall. It's routing between VLANs by a switch at layer 3. Inter-VLAN routing refers to routing traffic between different VLANs; commonly performed by a router or a layer-3 switch.

Correct Answer:

Inter-VLAN routing refers to routing traffic between different VLANs; commonly performed by a router or a layer-3 switch.

Explanation:

Inter-VLAN routing is needed because VLANs create separate broadcast domains, so devices in different VLANs can’t communicate just by switching frames. To move traffic between these networks, a device that can perform IP routing is required. A router handles this by connecting to each VLAN (often via subinterfaces on a trunk with 802.1Q tagging) and giving each VLAN its own subnet and gateway IP. In many modern networks, a Layer 3 switch provides the same capability directly on the switch, using SVIs or routed ports for each VLAN so traffic between VLANs is routed in hardware. End-user devices don’t perform inter-VLAN routing; they rely on a gateway. A firewall can route, but the standard, widely applicable device for this function is a router or a Layer 3 switch.

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