2. 计算机
  3. The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of th

The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of th

admin2015-05-18  30
问题 The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of the line．Typically，the protocol calls for the receiver to send back special  (12)flame bearing positive or negative  (13)about the incoming flames．If the sender receives a positive．Acknowledgement about a flame，it knows the flame has arrived safely．On the other hand，a negative acknowledgement means that something has gone wrong，and the frame must be transmitted again．An additional complication comes from the possibility that hardware troubles may cause a flame to(14)completely．In this case，the receiver will not react at all，since it has no any reason to react．It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement，positive or negative，will hang forever if a flame is ever lost due to，for example，(15)handware．(2008年下半年试题)
(12)
选项 A、date
B、control
C、request
D、session
答案B
解析
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