In(66)the strength of the carrier signal is varied to represent binary 1 or 0.(67)is a system that can map a name to an address 

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问题 In(66)the strength of the carrier signal is varied to represent binary 1 or 0.(67)is a system that can map a name to an address and conversely an address to al name.(68)is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol.(69)is an approach that enables an ATM switch to behave like a LAN switch.(70)is an guided media which is made of glass or plastic and transmits signals in the form of light.

选项 A、ASK
B、PSK
C、FSK
D、FDM

答案A

解析 本题主要考查调制的专业术语。ASK为幅度键控,PSK为移项键控的英文缩写,FSK为移频键控的英文缩写,FDM为频分多路复用的英文缩写。答案为A。
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