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"Mice belong to rodents. It is indeed their natural nature to be good at digging holes and drilling the ground, but how efficient is it to use this skill to avoid fire on the spot?" I still couldn't believe it, so I continued to ask.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.　　扮演主人公天下一的就是首次主演连续剧的松田翔太，他曾经凭借不少电影作品捧走许多新人大奖，在年轻一代演员中拥有很强的实力，今次则是他第一次挑战演出一名侦探。该剧讲述了迷茫的母亲们的恋爱与友情，以及她们追逐着与丈夫不同的男性的故事。福田亮介(《将恋爱进行到底》)担任导演，《大恋爱》《卖房子的女人》编剧大石静执笔剧本。