Essentially, ping sends an echo packet to the device, and expects the device to echo the packet contents back.
简单地说，ping向设备发送一个echo数据包，期望设备把数据包的内容发送回来。
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A ping flooding attack is a simple DDoS attack in which a computer sends a packet (ping) to another system with the intention of uncovering information about services or systems that are up or down.