work( ),systems that effectively isolate

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问题 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(请作答此空)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.hostsB.routersC.gatewaysD.offices

选项 A.hosts
B.routers
C.gateways
D.offices

答案 C

解析 掌握基本词汇,本题还是比较容易的。参考翻译如下:
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