()iscalledthegatewayofnetw(2020年下半年系统集成项目管理工程师上午综合知识真题解析)
() is called the gateway of network security, which is used to identify what kind of data packets can enter the enterprise intranet.
A. Anti-virus software
B. Trojan horse
C. Secret key
D. Firewall
参考答案: D
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