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From the following devices, which one is a Layer 1 device in the OSI model?
Router
Hub
Switch
Bridge
Hubs are considered Layer 1 devices because they forward data using physical layer standards. Hubs create one collision domain and one broadcast domain in its ports; this is because when hubs receive electrical signals from one port, they repeat it into all other ports, except the one it came into. Bridges and Switches are considered Layer 2 devices while routers are considered Layer 3 devices. Network Interface Card or NICs operate at Layer 2 of the OSI model.
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