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Which two statements are true about broadband cable （HFC） systems？（）
- A、Cable modems only operate at Layer 1 of the OSI model.
- B、Cable modems operate at Layers 1 and 2 of the OSI model.
- C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.
- D、A function of the cable modem termination system （CMTS） is to convert the modulated signal from the cable modem into a digital signal.
- E、A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.
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更多 “Which two statements are true about broadband cable （HFC） systems？（）A、Cable modems only operate at Layer 1 of the OSI model.B、Cable modems operate at Layers 1 and 2 of the OSI model.C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.D、A function of the cable modem termination system （CMTS） is to convert the modulated signal from the cable modem into a digital signal.E、A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.” 相关考题
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