In regard to a hub and spoke Frame-Relay data network, what kind of physical network is it classified as?（）

多项选择题Which of the following statements regarding ISDN are correct?（）

A. Each ISDN B channel has transmission speeds of up to 64 kbps.
B. The ISDN B channel can carry video, voice or data.
C. The ISDN B channel transmission rate varies depending on the service used.
D. The ISDN D channel transmits control information.
E. The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.

多项选择题Which of the following are correct regarding ISDN?（）

A. Legacy DDR can use port information to define interesting traffic.
B. Legacy DDR can configure multiple dialer configurations on the same interface.
C. Legacy DDR can use ACLs to define interesting traffic.
D. HDLC or PPP can be used to encapsulate ISDN D channel information.
E. The BRI interfaces on ISDN routers with dialer profiles configured cannot belong to multiple dialer pools.
F. Dialer profiles cannot use extended ACLs to define interesting traffic.

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

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