试题内容
() 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
查看答案
A. Anti-virus software
B. Trojan horse
C. Secret key
D. Firewall
软题库参考答案：D（仅供参考）
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