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.

由于网攻工具的泛滥，及网的缺陷，使得分布拒绝服务（DDoS）攻为网中危害面广、难以防御的攻。