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軟題庫 培訓(xùn)課程
試卷年份2020年下半年
試題題型【單選題】
試題內(nèi)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

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