Which addresses do Physical layer devicessuch as repeaters a

Which addresses do Physical layer devices—such as repeaters and hubs—examine in order to make forwarding decisions?

A. Physical

B. Logical

C. Host

D. None of the above

Solution

D is correct. Physical layer devices do not see addresses at all; they simply forward bits.

A, B, and C are incorrect. A is incorrect because physical addresses are used by Layer 2 devices, such as switches and bridges. B is incorrect because logical addresses are used by Layer 3 devices, such as routers. C is incorrect because “host” is a synonym for logical addresses.