Discussion
Where is a hub specified in the OSI model?
Answer: B
Correct answer: Physical layer
A hub simply regenerates and repeats the electrical signal out of every other port. It reads no addresses, makes no forwarding decisions and does not examine frames at all, so it belongs to the physical layer - it is a multiport repeater. A switch, which reads MAC addresses and forwards selectively, is a data link layer device, and a router, which reads IP addresses, is a network layer device.
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