2. 计算机
  3. The use of network(1)，systems that effectively isolate an organization’S internal network structure from an (2)network，such as t

The use of network(1)，systems that effectively isolate an organization’S internal network structure from an (2)network，such as t

admin2019-05-15  52
问题   The use of network(1)，systems that effectively isolate an organization’S internal network structure from an (2)network，such as the INTERNET is becoming increasingly popular．These firewall systems typically act as application—layer(3) between networks，usually offering controlled TELNET，FTP，and SMTP access．With the emergence of more sophisticated(4)layer protocols designed to facilitate global information discovery，there exi sts a need to provide a general (5)for these protocols to transparently and secure lytraverse a firewall．
(5)
选项 A、framework
B、intemetwork
C、computer
D、Application
答案A
解析 防火墙的使用使得那些与外部网络(例如因特网)隔离的机构内部网络日益变得流行起来。这些防火墙系统通常是作为网络之间的应用层网关而工作的，一般都提供了受控的TELNET、FTP和SMTP访问。随着适合于全球信息分享的更复杂的应用层协议的出现，于是提出了一种通用的框架，使得这些协议能够透明地安全地通过防火墙。
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