基于网络的攻击：这些攻击依赖于对网络数据包的低层访问，试图通过修改通信流或者发现这些数据包中的信息来危害系统。

Network-based attacks: these attacks rely on low-level access to network packets and attempt to harm the system by altering this traffic or discovering information from these packets.

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有一种称为syn泛滥(SYN flood)的网络攻击，它使ack数据包无法返回，导致服务器用光内存空间，无法处理到来的连接。

An attack called the SYN flood ensures that the ack packet never returns so that the server runs out of room to process incoming connections.

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通过数据包筛选和执行信任通信来抵御网络攻击。

To defend against network attacks through packet filtering and the enforcement of trusted communication.

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