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单选题
work（ ）,systems that effectively isolate an organization's internal network structure from an （ ） 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 （请作答此空）for these protocols to transparently and securely traverse a firewall.
A
B
C
D
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答案：
解析：
原文句子中的空白处需要填入一个词，与后面的"for these protocols to transparently and securely traverse a firewall"（为这些协议透明且安全地穿越防火墙）搭配，表达一种“框架”或“体系”的意思。选项A中的“framework”恰好符合这个意思，所以选A。
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