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Exam 640-692 Question id=178 Service-related Knowledge

Which of the following statements are true about a smart jack?

A. It provides signal conversion.
B. It operates at Layer 2 of the OSI model.
C. It regenerates the signal to compensate for signal degradation from line transmission.
D. It provides loopback testing.
E. It acts as a concentration point for dial-in and dial-out connections.