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  第72题      
  章/节:   专业英语       

 
The number of home users and small businesses that want to use the Internet is ever increasing. The shortage of addresses is becoming a serious problem. A quick solution to this problem is called network address translation(NAT).NAT enables a user to have a large set of addresses(71)and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic(72), the small set. To separate the addresses used inside the home or business and the ones used for the Internet, the Internet authorities have reserved three sets of addresses as (73)addresses. Any organization can use an address out of this set without permission from the Internet authorities. Everyone knows that these reserved addresses are for private networks.They are (74) inside the organization, but they are not unique globally. No router will (75) a packet that has one of these addresses as the destination address.The site must have only one single connection to the global Internet through a router that runs the NAT software.
 
 
  A.  local
 
  B.  outside
 
  C.  middle
 
  D.  around
 
 
 

 
  第72题    2010年下半年  
   69%
A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) comm..
  第73题    2011年上半年  
   67%
The presentation layer is concerned with the(71)and semantics of the information exchanged between two systems. The proc..
  第72题    2013年下半年  
   54%
OSPF is a link-state routing protocol. It is designed to be run internal to a single (71) system. Each OSPF router maint..
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