依据所要保护的网络类型、采用的边界防护系统和保护级别采取不同方式的入侵检测系统。
According to the type of network to be protected, boundary protection system adopted and different protection rank, the mode of entering into detection system is ranked either.
由于集中监测系统为非安全系统，从系统边界防护角度考虑，应该对集中监测系统和其它系统之间的通信接口采用安全通信协议。
As the centralized monitoring system is a non secure system, it is necessary to adopt a secure communication protocol between the centralized monitoring system and other systems.
那时候，当土著人来夺取防护西部边界的那些城堡时，他们就使用鼓声作为预先的示警。
At the time, drums were used to fore warn that the natives were going to capture the forts, which guarded the western frontier.
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