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  第72题      
  章/节:   计算机专业英语       

 
A transport layer protocol usually has several responsibilities. One is to create a process-to-process communication; UDP uses (71) numbers to accomplish this. Another responsibility is to provide control mechanisms at the transport level. UDP does this task at a very minimal level. There is no flow control mechanism and there is no (72) for received packet. UDP, however, does provide error control to some extent. If UDP detects an error in the received packet, it silently drop it.
The transport layer also provides a connection mechanism for the processes. The (73) must be able to send streams of data to the transport layer. It is the responsibility of the transport layer at (74) station to make the connection with the receiver, chop the stream into transportable units, number them, and send them one by one. It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived, check and pass those that are (75) free, and deliver them to the receiving process as a stream.
 
 
  A.  connection
 
  B.  window
 
  C.  acknowledgement
 
  D.  destination
 
 
 

 
  第71题    2012年下半年  
   49%
  第71题    2010年上半年  
   53%
Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system..
  第75题    2011年上半年  
   71%
Border Gateway Protocol (BGP) is inter-autonomous system (71) protocol. BGP is based on a routing method called path vec..
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第72题    在手机中做本题