單項選擇題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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3.單項選擇題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?（）

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

4.單項選擇題Which one of the WAN data-link protocols below is used for out-of-band signaling?（）

A. HDLC
B. NCP
C. PAP
D. LAPD
E. LAPB
F. None of the above

5.多項選擇題Which of the following correctly describe characteristics of PPP?（）

A. Encapsulates several different types of routing protocols.
B. Supports only IP.
C. Can be used over analog circuits.
D. Is proprietary to Cisco
E. Supports error correction.

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