多项选择题
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.
多项选择题 Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）
多项选择题 Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?（）
多项选择题 A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased?（）