( ) is called the gateway of network security, which is used toidentify what kind of data packets
( ) is called the gateway of network security, which is used toidentify what kind of data packets can enter the enterprise intranet. (2020年系统集成项目管理工程师下半年)
A. Anti-virus software
B. Trojan horse
C. Secret key
D. Firewall
参考答案: D
参考解析:
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