2012年软件水平网络工程师考试英语考前冲刺题（4）
LAPB is a (1) protocol that provides complete data transparency ina (2)operation. It supports a peer-to-peer link in that neither endof the link plays the role of the permanent master station.HDLC LAPB is the (3)that is usually used by(4), the (5)standard forPacket Switched Networks. (1)A．bit-oriented synchronous B．byte-oriented synchronousC．bit-oriented asynchronous D．byte-oriented asynchronous
(2)A．half-duplex point-to-point B．half-duplex point-to-points
C．full-duplex point-to-point D．full-duplex point-to-points
(3)A．Physical Layer B．Link Layer
C．Network Layer D．Transport Layer
(4)A．X.21 B．X.25 C．X.28 D．X.29
(5)A．ITU B．IEEE C．OSI D．ANSI
答案:1:A,2:C,3:B,4:B,5:A
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