work（请作答此空）,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 （ ）for these protocols to transparently and securely traverse a firewall.A.safeguardsB.firewallsC.routersD.switches
work（请作答此空）,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 （ ）for these protocols to transparently and securely traverse a firewall.
A.safeguards
B.firewalls
C.routers
D.switches
B.firewalls
C.routers
D.switches
参考解析
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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