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  3. The number of home users and small busin

The number of home users and small busin

最全题库2022-08-02  44
问题 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（  ）and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic（  ）, 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 （  ）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 （  ） inside the organization, but they are not unique globally. No router will （  ） 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.privateB.commonC.publicD.external
选项 A.private
B.common
C.public
D.external
答案 A
解析 解题需要理解NAT的原因及工作过程。

想要使用互联网的家庭用户和小企业的数量在不断增加。地址不足正成为一个严重的问题。一个快速解决这个问题的方法叫做网络地址转换（NAT），NAT允许用户拥有一个大的地址集（内部）和一个或一个小的地址集（外部）。里面的交通可以用大的一套；外面的交通可以用小的一套。为了区分家庭或企业内部使用的地址和互联网使用的地址，互联网管理局保留了三组地址作为（私人）地址。任何组织都可以在未经Internet授权的情况下使用此集合之外的地址。每个人都知道这些保留的地址是私人的网络。他们在组织内部是（唯一的），但在全球范围内不是唯一的。没有路由器会（转发）以这些地址之一作为目的地的数据包地址。地址站点必须只有一个通过运行NAT软件的路由器连接到全球互联网的连接。
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软件水平考试初中高级

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