Which type of device can be replaced by the use of subinterfaces for VLAN routing?

The correct answer is C. Layer 3 switch. In a traditional "Router-on-a-Stick" configuration, a router uses subinterfaces to route traffic between different VLANs. Each subinterface acts as the default gateway for a specific VLAN. However, a Layer 3 switch (also known as a Multilayer Switch) can perform this same inter-V

Submitted by ahmad_uae· Mar 5, 2026Network Access

Question

Options

ALayer 2 bridge
BLayer 2 switch
CLayer 3 switch
Drouter

How the community answered

(46 responses)

A
7% (3)
B
2% (1)
C
89% (41)
D
2% (1)

Explanation

In a traditional "Router-on-a-Stick" configuration, a router uses subinterfaces to route traffic between different VLANs. Each subinterface acts as the default gateway for a specific VLAN. However, a Layer 3 switch (also known as a Multilayer Switch) can perform this same inter-VLAN routing internally using SVIs (Switch Virtual Interfaces). When you upgrade to a Layer 3 switch, you no longer need the external router and its subinterfaces to move traffic between VLANs.

Topics

#inter-VLAN routing#subinterfaces#router-on-a-stick#Layer 3 switching

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