Which of the following describes the roles of devices in a WAN? (Choose three.)
A.
A CSU/DSU terminates a digital local loop.
B.
A modem terminates a digital local loop.
C.
A CSU/DSU terminates an analog local loop.
D.
A modem terminates an analog local loop.
E.
A router is commonly considered a DTE device.
F.
A router is commonly considered a DCE device.
The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The network’s DCE device (includes CSU/DSU) provides clocking to the DTE-connected interface (the router’s serial interface).
wan_dlci_understand
A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device. A CSU/DSU is used between two digital lines -> A & D are correct but B & C are not correct.
For more explanation of answer D, in telephony the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service provider’s network. Therefore a modem terminates an analog local loop is correct.
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