2. 计算机
  3. Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communic

Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communic

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问题 Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the development of packet switching, early computer networks used leased, dedicated telephone circuits to(74) with terminals and other computers. In circuit-switched networks such as the telephone system, a complete point-to-point(75) is put together, and then communication can proceed.
选项 A、sequence
B、line
C、board
D、circuit
答案D
解析 参考译文：分组交换是将数字信息放到“包”里面的一种技术，发送的数据包为沿不同的可用路径传输，一旦到达目的地它们就重新打包。在分组交换出现以前，早期的计算机网络是通过租用电话线的方式来实现计算机之间的通信的。在电路交换网络中，如电话系统，它是将一条完整的点对点的电路放在一起，然后再进行通信。
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