In an environment with one router, which of the following will allow a network engineer to communicate between VLANs without purchasing additional hardware?
A subinterface is a logical interface created on a single physical router interface that allows routing between VLANs (known as Router-on-a-Stick (ROAS)). This method is commonly used when only one physical router is available, allowing inter-VLAN communication without additional hardware.
•Why not the other options?
•VXLAN (B) – This is used for extending Layer 2 networks over a Layer 3 infrastructure, primarily in data centers. It does not directly enable inter-VLAN communication.
•Layer 3 switch (C) – A Layer 3 switch can route between VLANs, but the scenario states that purchasing additional hardware is not an option.
•VIR (D) – This is not a standard networking term in the context of VLAN communication.
[Reference:, CompTIA Network+ (N10-009) Official Guide – Chapter 8: VLANs and Inter-VLAN Routing, , , , ]
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