inundant

Because the tools of network attack are inundant and the protocol is imperfect, Distributed Denial of Service（DDoS） attack is an attack manner once leading to widest harm, which is hardest to defense.

由于网络攻击工具，及网络协议缺陷，使得分布式拒绝服务（DDoS）攻击为网络中危害面广、难防御攻击方式。