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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.　　至于这部歌舞片的男主角，聂文邀请了来自香港的当红男星林见东，聂文给出的片酬并不高，但林见东却一口就答应了出演，为此经纪人一路都在埋怨他。-Remove the DAEMONToolsLite panel;信仰与哲学想来具有排它性，如果信了一个，就不好信另外一个了。3. Ships of 12m length:魏豹虽然也意识到形势会有些不妙，可毕竟还是对大河岸边的那些军队报以厚望，尚未如此背观。　　娜娜奇也成为两人的同伴，三人的冒险向着波多尔多所在的深界五层进发。