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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.[Introduction] Five articles of the "Three Rural Areas Social Practice Report" collected by 51job Kao Network are for your reference and more relevant contents. Please visit the internship report channel.Ningxia Hui Autonomous Region这一番调兵遣将后，众皇子都松了口气：老二终于要交出兵权了。If the server returns replies other than the above three replies, or if the PING command is not returned within the specified time, the Sentinel process considers the reply returned by the server non-valid.　　剧集根据《法医秦明》系列的第一部作品改编。NBC的《#好女孩# Good Girls》第三季宣布增加3集，使新季为16集。《好女孩》过去两季皆为13集，而第三季同样暂定季中档播出。