单项选择题

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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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
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You are preparing to create a point to point WAN by connecting a Cisco router with a Juniper router by way of their serial links. Which one of the following commands would you use?（）

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C. TK1(config-if)# encapsulation LAPD
D. TK1(config-if)# encapsulation frame-relay ietf
E. TK1(config)#encapsulation ppp