2. 计算机
  3. With circuit switching,a (71)________________path is established between two stations forcommunication．Switching and transmissi

With circuit switching,a (71)________________path is established between two stations forcommunication．Switching and transmissi

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问题 With circuit switching,a  (71)________________path is established between two stations forcommunication．Switching and transmission resources within the network are  (72)________________  for theexclusive use of the circuit for the duration of the connection．The connection is (73)________________  ：Once it is established，it appears to attached devices as if there were a direct connection．Packet switching was designed to provide a more efficient facility than circuit switching  for  (74)________________data traffic．Each packet contains some portion of the user data plus control  information needed for proper functioning of the network．A key distinguishing element of  packet-switching networks is whether the internal operation is datagram or virtual circuit．With  internal virtual circuits，a route is defined between two endpoints and all packets for that  virtual circuit follow the  (75)________________  route．With internal datagrams，each packet is treated  independently，and packets intended for the same destination may follow different routes．
选项 A、same
B、difierent
C、single
D、multiple
答案A
解析     使用电路交换技术，在两个站点之间建立一条专用的通路。在该链接存在期间，网络内的交换和传输资源完全为该电路的使用而保留。这个连接是透明的：一旦建立起连接，对与之相连的设备来说，好像存在一条直接连接一样。分组交换可在突发通信中提供比电路交换更高效的解决方案。每个分组都由一部分用户数据及控制信息组成，这些控制信息是网络正常工作所必需的。内部操作采用的是数据报还是虚电路是区分分组交换网的一个关键要素。使用虚电路方式时，在两个端点之问定义了一条路由，该虚电路的所有分组都沿着同一路由前进。使用数据报方式时，各分组被独立处理，终点相同的分组可能会沿不同的路由前进。
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