Router on a stick

what is the meaning of this question and what's the possible best answer: ============================ Q- Why is router on a stick a necessary solution?

1-because Layer 2 LAN switches can also operate at Layer 3 2-because routers cannot route packets between multiple VLANs 3-because Layer 2 LAN switches can only support a single VLAN 4-because Layer 2 LAN switches cannot switch frames between multiple VLANs ============================================
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A switch or hub only forwards packets within a single subnet. VLANs partition a physical switch into multiple virtual switches, each for a different subnet. A router is needed transfer (route) packets between different subnets.

Two Switches can be connected via a single cable that contains VLAN information within each packet so that several VLANs on one switch can each be independently connected to the corresponding VLAN on a second switch.

Or, that same tagging technique can be used to connect multiple vlans to a router over a single physical port, so that the router ('on a stick") can transfer (route) the packets from one subnet (vlan) to another subnet (vlan) on the same physical switch. Otherwise, if you had 4 vlans on a switch, you would need 4 ethernet ports on a router in order to connect the different subnets.

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Correct answer is #4.

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Cisco Kid

the answer is 4-because switches can't netgotiate different vlans

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