多项选择题
Which statements are true regarding ISDN channels?（）
A. Each B channel can transmit up to 64 kbps
B. The ISDN B channel carries voice or data
C. The ISDN D channel transmits control information.
D. The D channel transmission rate varies depending on the service used.
E. HDLC or PPP can be used to encapsulate D channel information.
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相关考题
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单项选择题
Which ISDN device converts the four-wire BRI signals from an S/T interface into two-wire signals of a U interface?（）
A.TE1
B.NT-2
C.TA
D.TE2
E.NT-1 -
单项选择题
Which WAN protocol is used for out-of-band signaling?（）
A.NCP
B.HDLC
C.LAPB
D.LAPD -
单项选择题
Inverse ARP is being used in the TestKing frame relay network. What is the purpose of Inverse ARP?（）
A. To ma a known IP address to a MAC address
B. To map a known DLCI to a MAC address
C. To ma a known MAC address to an IP address
D. To ma a known DLCI address to a IP address
E. To ma a known IP address to a SPID address
F. To ma a known SPID address to a MAC address
