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

单项选择题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

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

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.