(71) In the strength of the carrier signal is varied to represent binary 1 or 0. (72) is a system that can map a name to an

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问题 (71) In the strength of the carrier signal is varied to represent binary 1 or 0.
   (72) is a system that can map a name to an address and conversely an address to an name.
   (73) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol
   (74) is an approach that enables an ATM Switch to behave like a LAN switch.
   (75) 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

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