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  第72题      
  章/节:   计算机专业英语       

 
Network Addres Translation(NAT) is an Internet standard that enbles a local-area network to use one set of IP addresses for internet traffic and another set of (71) IP addresses for external traffic. The main use of NAT is to limit the number of public IP addresses that an organization or company must use, for both economy and (72) purposes. NAT remaps an IP address space into another by modifying network address information in the (73) header of packets while they are in transit across a traffic routing device. It has become an essential tool in conserving global address space in the face of (74) address exhaustion. When a packet traverses outside the local network, NAT converts the private IP address to a public IP address. If NAT runs out of public addresses, the packets will be dropped and (75)"host unreachable"packets will be sent.
 
 
  A.  political
 
  B.  fairness
 
  C.  efficiency
 
  D.  security
 
 
 

 
  第75题    2017年下半年  
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routing in circuit-switching networks has traditionally involved a static routing strategy with the use of(71)paths to..
  第72题    2010年下半年  
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The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network..
  第75题    2013年下半年  
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The de facto standard Application Program Interface (API) for TCP/IP applications is the ”sockets” interface..
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