() is called the gateway of network securit

() is called the gateway of network security, which is used to identify what kind of data packets can enter the enterprise intranet. 【轉自信管網(wǎng)(cnitpm.com)】
A. Anti-virus software
B. Trojan horse
C. Secret key
D. Firewall

信管網(wǎng)參考答案：D

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