多项选择题
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?（）
单项选择题 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?（）