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免费智能真题库 > 历年试卷 > 网络工程师 > 2018年下半年 网络工程师 上午试卷 综合知识
  第75题      
  章/节:   计算机专业英语       

 
The TTL field was originally designed to hold a time stamp, which was decremented by each visited router.The datagram was (71) when the value became zero.However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another.Today, this field is used mostly to control the (72) number of hops (routers) visited by the datagram. When a source host sends the datagram, it (73) a number in this field.Each router that processes the datagram decrements this number by 1.If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the (74).This field limits the (75) of a datagram.
 
 
  A.  lifetime
 
  B.  moving time
 
  C.  receiving time
 
  D.  transmitting time
 
 
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  第75题    2018年上半年  
   58%
With circuit switching, a (71)path is established between two stations for communication . Switching and transmission ..
  第75题    2009年上半年  
   68%
The Border Gateway Protocol (BGP) is an interautonomous system (71) protocol. The primary function of a BGP speaking sys..
  第72题    2019年上半年  
   61%
Network security consists of policies and practices to prevent and monitor(71)access,misuse, modification, or denial o..
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