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单选题

work( ),systems that effectively isolate an organization's internal network structure from an (请作答此空) network, such as the INTERNET is becoming increasingly popular. These firewall systems typically act as application-layer( )between networks, usually offering controlled TELNET, FTP, and SMTP access. With the emergence of more sophisticated( )layer protocols designed to facilitate global information discovery , there exists a need to provide a general ( )for these protocols to transparently and securely traverse a firewall.

A
exterior
B
Internal
C
center
D
middle
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答案:

A

解析:

题干中提到的是"isolate an organization’s internal network structure from an (请作答此空) network",意思是要隔离组织的内部网络结构和一个外部网络,所以空格处应填写“外部网络”,选项A为正确答案。同时,下文提到的防火墙系统位于网络之间,作为一个应用层中心(center)来发挥作用,但题目中的空格并不在此处,因此B、C、D选项不符合题意。

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