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  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
 
 
 

 
  第71题    2022年下半年  
   76%
Network firewalls are security devices used to stolo or mitigate(71) access to private networks connected to the Interne..
  第73题    2020年下半年  
   60%
The Address Resolution Protocol(ARP)was developed to enable communication on an Internetwork and perform a required func..
  第72题    2010年下半年  
   38%
The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network..
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