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

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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

多项选择题

WAN data link encapsulation types include which of the following?（）

A. T1
B. Frame Relay
C. DSL
D. PPP
E. ISDN
F. IPX