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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.安桐心里咯噔一下，已经明白了辛刚话里的意思。上一季已经知道A是谁，这一季来了新的A……　　古镇方桥绣庄林立，恰似姹紫嫣红的偌大花圃。而明德绣庄更是一枝独秀的奇葩，闻名遐迩，因为它拥有独门绝技缂针绣和一位技艺超群的绣娘。缂针绣绝无仅有的传人阿秀，靓丽、灵秀、身世迷离，其人其技深藏绣阁，密不示人。In addition, producer Tang Lin revealed that the second season of "Charming China City" will be made into an international program. From guest judges to audience to the design of the Charming Ceremony, international people will be invited to participate in the program so that they can spread Chinese stories to the world through their own experiences and feelings.The command mode is well understood. For example, the commander ordered the soldiers to do something. From the perspective of the whole thing, the commander's role is to issue a password, which is transmitted to the soldiers' ears and executed by the soldiers. Fortunately, the three are decoupled from each other. Neither side needs to rely on others, but only needs to do its own thing. The commander wants the result and will not pay attention to how the soldiers achieve it. Let's look at the diagram: