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單項(xiàng)選擇題

You have a single ISDN BRI B channel. What is its maximum bandwidth capacity of this one channel?（）

A. 16kb/s
B. 64kb/s
C. 128kb/s
D. 144kb/s
E. 192kb/s
F. 256kb/s

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單項(xiàng)選擇題

A new asynchronous connection is being installed in your network. Which pair of WAN encapsulations types is suitable for asynchronous lines?（）

A. PPP and ATM
B. PPP and SDLC
C. ATM and HDLC
D. SDLC and HDLC

單項(xiàng)選擇題

Which WAN technology was designed to give homes and small business high speed digital dial-up service over already existing communication infrastructure?（）

A. X25
B. Frame Relay
C. ATM
D. ISDN
E. ATX
F. None of the above

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