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

The multi-level defense system is mainly reflected in the network level and the system level. Which of the following options are used for the security defense at the network level? (Multiple Choice)
A . Software SACG
B . Hardware SACG
C . 802.1X switch
D . Authentication Server

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Answer: ABC