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.
Correct Answer: ADE
Modems and CSU/DSU are considered DCE: data communications equipment, parts of the WAN itself. Routers are considered DTE: data terminating equipment,
right on the edge of the WAN and not really part of it. Modems are considered to be analog devices and terminate an analog local loop. CSU/DSU devices are
considered to be digital and terminate a digital local loop.