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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74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.  switch
 
  B.  router
 
  C.  source host
 
  D.  destination host
 
 
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  第73题    2022年上半年  
   35%
A network attack is an attempt to gain(71)access to an organization’s network,with the objective of stealing data or ..
  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..
  第71题    2023年上半年  
   38%
An Intrusion (71) System (IDS) is a system that monitons network traffic for suspicious activity and alerts when such ac..
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