英语翻译A packet filter configured to protect an organization ag

英语翻译
A packet filter configured to protect an organization against traffic from the rest of the Internet is called an Internet firewall; the term is derived from the fireproof physical boundary placed between two structures to prevent fire from moving between them.Like a conventional firewall,an Internet firewall is designed to keep problems in the Internet from spreading to an organization’s computers.
Firewalls are the most important security tool used to handle network connections between two organizations that do not trust each other.By placing a firewall on each external network connection,an organization can define a secure perimeter that prevents outsiders from interfering with the organization’s computers.In particular,by limiting access to a small set of computers,a firewall can prevent outsiders from probing all computers in an organization or flooding the organization’s network with unwanted traffic.
A firewall can lower the cost of providing security.Without a firewall to prevent access,outsiders can send packets to arbitrary computers in an organization.Consequently,to provide security,an organization must make all of its computers secure.With a firewall,however,a manager can restrict incoming packets to a small set of computers.In the extreme case,the set can contain a single computer.Although computers in the set must be secure,other computers in the organization do not need to be.Thus,an organization can save money because it is less expensive to install a firewall than to make all computer systems secure.

小包过滤器被配置保护组织免受交通免受互联网的剩余称互联网防火墙; 期限从耐火物理界限被获得被安置在二个结构之间预防火灾行动在他们之间.象一个常规防火墙,互联网防火墙被设计保留问题在互联网从传播对组织的计算机.防火墙是最重要的安全工具被使用处理网络连接在不互相信任的二组织之间.由安置防火墙在各外在网络连接,组织可能定义防止局外人干涉组织的计算机的安全周长.特别是,由限制对小套的通入计算机,防火墙可能防止局外人探查所有计算机在组织或充斥组织的网络以不需要的交通.防火墙可能降低提供安全的费用.没有防火墙防止通入,局外人能寄发小包到任意计算机在组织.结果,提供安全,组织必须使所有它的计算机安全.与防火墙,然而,经理能对小套计算机制约接踵而来的小包.在例外情况,集合可能包含一台唯一计算机.虽然计算机在集合必须是安全,其它计算机在组织不需要是.因而,组织可能存金钱因为它是较不昂贵安装防火墙比使所有计算机系统安全.