Which two networking devices operate at Layer 1 of the OSI model? (Choose two.)
A.
Repeater
B.
Bridge
C.
Switch
D.
Router
E.
Hub
Explanation:
It defines the electrical and physical specifications of the data connection. It defines the
relationship between a device and a physical transmission medium (e.g. a copper or fiber optical
cable). This includes the layout of pins, voltages, line impedance, cable specifications, signal
timing, hubs, repeaters, network adapters, host bus adapters (HBA used in storage area networks)
and more.”
http://en.wikipedia.org/wiki/OSI_model