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  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、indistinct
B、direct
C、indirect
D、transparent
答案D
解析
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