The multi-level defense system is mainly embodied at the network level and system level. Which of the following options are used for security protection at the network level? (Multiple choices)

The multi-level defense system is mainly embodied at the network level and system level. Which of the following options are used for security protection at the network level? (Multiple choices)
A . Software SACG
B . Hardware SACG
C . 802.1X switch

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Answer: ABC