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 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、PPP
B、PAP
C、CHAP
D、LCAP

答案C

解析与上题的解题思路相似，利用定义理解。

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