difrerença

Procura pelo wikipedia, 2 e 3 encontra-se 2/3 nunca vi.

And Layer 2 and Layer 3 switch? <

Simply put, a Layer 3 switch is basically a router combined with a switch. Layer 3 switches are always managed. Say for example if you set up two VLANS, each with their own IP subnet, a layer 3 switch can route traffic between them. A layer 2 switch would require an external router to pass IP traffic across different networks.
 
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