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The most basic defense at the network layer is RFC? 2827 [3]. Using input source filtering, ISP refuses to route a packet whose source IP address does not belong to its source subnet further. Input source filtering can effectively prevent SYN flooding attacks disguised as IP. However, this method is useless at present because it is difficult to deploy on a large scale. Moreover, input source filtering cannot resist distributed attacks.杨长帆连连感叹：何兄大才啊。When I heard this, I coughed gently and motioned for his words to be a bit off the topic. Wang Zeduan was embarrassed at first. Looking at his expression, he did feel that what he said had nothing to do with the topic, but then he smiled and didn't care, but went on to say:在县城当民工的鞠广大得知母亲去世的消息后迅速赶回家中，却在邻家哭丧的人群里发现了活生生的母亲崔大脚。鞠广大和众多农民一样加入麦收大潮，在县城打工的经历使他在农民中无比荣耀，然而荣耀背后却是只有自己才能体会到的辛酸。鞠广大的儿子鞠双元高考三次不中，发誓绝不再考。为给儿子来年再考挣学费，麦收刚完鞠广大就踏上了回县城的火车，谁知来到工地却已被除名，鞠广大找工头要三个月的工钱，却被无情的赶出工地。要强的鞠广大不愿如此狼狈的回家，偷偷跳上了一列开往省城的货车……剧集通过四十年的时代跨度，描述了一支王牌军队的成长历程，通过对个体的刻画，塑造了一群有灵魂、有本事、有血性、有品德的新一代军人，以小见大见证国之重器的蜕变之路，浓墨重彩描绘军事国防的希望与未来，为强军变革的大背景下，一曲我军新时期军魂的激情赞歌。更为重要的是如何来组建和经营这个组织，尹旭虽然懂得一些知识，可巧fù难为无米之炊。