单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
多项选择题
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.
