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  57
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．
(3)
选项 A、hosts
B、routers
C、gateways
D、offices
答案C
解析
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