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单选题

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
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答案:

B

解析:

根据题目描述,这些防火墙系统有效地隔离了组织的内部网络结构和外部网络(如互联网),并通常在网络之间充当应用层网关,提供受控制的TELNET、FTP和SMTP访问。因此,正确答案是B,即防火墙(firewalls)。其他选项的含义分别是:A.保护措施;C.路由器;D.交换机,均不符合题意。随着全球信息发现协议的出现,需要提供一个通用的解决方案,使这些协议能够透明、安全地穿越防火墙,这也进一步表明了防火墙在网络安全中的重要性和作用。

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