a firewall is both policy and the implementation of that policy in terms of ()，()，and (), as well as other security measuresA、network configurationB、host systemsC、routersD、softwares此题为多项选择题。

未知题型

a firewall is both policy and the implementation of that policy in terms of ()，()，and (), as well as other security measures

A、network configuration
B、host systems
C、routers
D、softwares
此题为多项选择题。

【参考答案】

A,B,C

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