单选题（） is not a physical wall, but a lot of virtual data to protect the computer network.ADate wallBDate channelCDatabaseDFirewall
单选题
（） is not a physical wall, but a lot of virtual data to protect the computer network.
A
Date wall
B
Date channel
C
Database
D
Firewall
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单选题（）is not a physical wall but a flow virtual data to protect the computer network.Adata wallBdata channelCdatabaseDfirewall