DoS attack is a common way to attack the network.

拒绝服务攻击是攻击网络系统的一种常用方法。

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For network security, it is important to defend from DOS attack.

如何防御DOS攻击是网络安全中一个重要的方向。

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But in most cases, what's really being referred to is a distributed DoS attack.

但是在大多数情况下，实际涉及到的是分布式DoS攻击。

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The analogy used is that usually a DoS attack is like clogging up the on off ramps of a freeway: this amount of traffic is like clogging up the freeway itself.

FORBES: The Biggest Cyber-Attack Ever Is Slowing Down The Internet