2. 计算机
  3. (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

(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、Coaxial cable
B、Optical fiber
C、Unshielded Twisted-pair Cable
D、Shielded Twisted-pair Cable
答案B
解析 在幅频键控(ASK)调制中，载波的振幅随所表示的0、1变化；DNS是一种能够将名字映射为IP地址同时也可以将IP地址映射为名字的系统；CHAP是一种利用三次握手机制的认证协议，它的数据包被封装在点对点链路协议上：LANE是一种能够让ATM交换机象局域网交换机一样的方式；光纤是一种用玻璃纤维和塑料外套制成的传输介质，它上面以光的形式来传输信号。
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