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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.11岁时，艾伦（格兰特·古斯汀 Grant Gustin 饰）的母亲离奇死亡，而他的父亲则被当成了凶手。之后，警探乔（杰西·马丁 Jesse L. Martin 饰）收留了孤苦伶仃的艾伦，在乔的耳濡目染之下，成年后的艾伦成为了一名CSI鉴证分析员，在此过程中，他一直没有放弃过对于母亲真正死因的调查。Action: Laugh heartily.《血云幡传奇》是台湾电视剧《包青天》（1993版）系列里的一个故事，系第二十六个单元（140-144集）。女保镖巴尔莎和皇太子查古穆再次共同踏上旅途。曾在巴尔莎的保护下活下来的小男孩，在艰辛的旅程中，长成了伟大的皇太子。两人来到了巴尔莎的故乡砍巴尔王国。在美丽而严酷的大自然中，巴尔莎揭开了埋藏在王国深处的阴谋。另一方面，新尤古国遭到塔鲁修帝国攻击，查古穆为了拯救濒死的新尤古国，与罗塔王国及砍巴尔王国结城同盟归来逆转了形势。北方诸国蠢蠢欲动，查古穆与父王的对决一触即发。巴尔莎全力寻找成为战争牺牲品的汤达，终于与重伤的汤达重逢，但却一起被塔鲁修军队俘获。于是，查古穆来到塔鲁修大军的营地。塔鲁修帝国的拉尔鲁王子和查古穆巴尔莎展开面对面交锋。就在这时，天摇地动，金色的鸟从天而降...由《婴宁》《胭脂》《义犬》《粉蝶》《莲香》和《罗刹海市》6个单元剧组成的《聊斋志异系列2》汇集了内地港台三地众多的优秀演员和新秀，如刘雪华、韩雪、严宽、陈浩明等，必将成为众人瞩目的焦点。 《婴宁》——讲述看守蟠桃园的稻草人仙子婴宁（六月 饰）向往人间追求美好爱情，决定有朝一 日，定要好好的体会一下人世间爱情的滋味。但她真诚的愿望不为世俗所容纳，一段大好情缘终于付诸流水。 《义犬》——讲述商人贾德受灵狸之恩，反将其食之。十年后，灵狸不惜逃出天界至贾家报仇。贾之女双双（林静 饰）偶然救了下凡的吼天犬（陈浩民 饰）。犬为了阻止狸肆虐，展开大战，狸终被伏。双双为赎父罪，与犬一起，以医术济世为怀。 《胭脂》——讲述胭霞与亲妹胭脂（韩雪 饰）相依唯命，联手打理父亲遗下的酒楼，千年石妖欲利用姐姐胭霞加害胭脂。但姐妹真情的力量最终战胜了邪恶的妖魔。 《粉蝶》——讲述画师阳曰旦（彭于晏 饰）和粉蝶公主（刘品言 饰）相恋，遭蜂王恶意阻绕。粉蝶在合上眼后现仙身而不自知，入梦中蝶谷，亲眼见到一场蝶谷的大屠杀，粉蝶大骇......当他的新女友因技术原因被驱逐出境时，罗斯雇用了一名假丈夫将她送回乡下，因为他还没有准备好结婚。