Probabilistic Packet Marking (PPM) is an efficient and practical scheme.

概率包标记(PPM)是一种比较有效且实用的解决方法。

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Probabilistic Packet Marking for IP Traceback was proposed to defend against distributed denial-of-service attacks.

数据包抽样标记技术是为了应对分布式拒绝服务攻击而提出的一种IP追踪技术。

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Probabilistic packet marking (PPM) is a practical and effective method for IP traceback of denial-of-service(DoS) attack.

随机数据包标记（PPM）是对拒绝服务攻击进行IP回溯的一种实用而有效的方法。

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They looked down at the solitary flower bed, at the bright-colored seed packets marking the empty rows, each packet pierced with a stick.

NEWYORKER: The Woman of the House