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Recently, I have made a preliminary investigation on DDOS attacks, and have some superficial understanding of the causes of DDOS attacks and their detection and defense mechanisms. This paper focuses on some thoughts on DDOS attacks in metropolitan area network environment under traditional network architecture.On March 5, 2014, during the media open day of the Second Session of the 12th National People's Congress, a female reporter did not win the opportunity to interview and left tears of regret after the meeting.14In my program, I just started embedded cassandra and used cassandra-driver-core to connect to cassandra, so UDP socket was occupied a lot at once, and redisson needed to initialize its own connection pool when starting, which also needed UDP socket, thus causing this problem. Netty's ClassCastException ate the real exception, making it more difficult to troubleshoot this problem.媳妇听了叫屈道：都是那些人说的，我一句也没掰扯，我不过就是带着两个耳朵听。After receiving the report, the police arrived at the scene and found more doubts besides the killed puppy:5. Close-fitting management consultants will implement "one-stop" considerate operation guidance and strong control support.