2. 计算机
  3. The number of home users and small businesses that want to use the Internet is everincreasing．The shortage of addresses is becom

The number of home users and small businesses that want to use the Internet is everincreasing．The shortage of addresses is becom

admin2020-04-30  73
问题 The number of home users and small businesses that want to use the Internet is everincreasing．The shortage of addresses is becoming a serious problem．A quick solution to thisproblem is called network address translation(NAT)．NAT enables a user to have a large set ofaddresses  (71)  and one address，or a smallset of addresses，extemally．The traffic insidecan use the large set；the traffic  (72)  ，the small set．To separate the addresses used inside thehome or business and the ones used for the Internet．the Internet authorities have reservedthree sets of addresses as  (73)  addresses．Any organization can use an address out of thisset without permission from the Internet authorities．Everyone knOWS that these reservedaddresses are for private networks．They are  (74)  inside the organization，but they are notunique globally．No router will  (75)  a packet that has one of these addresses as thedestination address．The site must have only one single connection to the global Internetthrough a router that runs the NAT software．
选项 A、reject
B、receive
C、deny
D、forward
答案D
解析     随着使用互联网的家庭和小企业数量的不断增加，IP地址短缺成了一个严重的问题。网络地址转换(NAT)是解决这个问题的一个快速解决方案。NAT使用户能够在内部拥有大量的地址，而在外部只有一个或很少的一组地址。内部数据可以使用大量的内部地址，外部数据则使用很少的外部地址。为了区分内部地址和用于互联网的外部地址，互联网主管部门保留了三组地址作为私有地址，任何组织都可以在没有许可的情况下使用这些地址。这些保留地址用于私人网络，它们在组织内部是独一无二的，但在全球范围内并不唯一。路由器不会转发任何一个目的地址为私有地址的数据报，运行NAT软件的路由器可以实现内部站点到全球互联网的通信。
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