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

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问题 In(66)the strength of the carder 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 an 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、NAT
B、NCP
C、DDN
D、DNS

答案D

解析 本题主要考查域名系统的缩写DNS。答案为D。
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