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The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.Why is feedback so useful for deliberate practice? In the article "Failure is not the Mother of Success, Success is the Mother of Success" by Teacher Wan Weigang, it is stressed that feedback is divided into two types: one is to accuse you of not being able to do it yourself, and this feedback will bring bad effects. 2 refers to the right thing, not that you can't do it, but that what you do can be better promoted through improvement. Effective feedback is that "good is failure" needs to meet three conditions. 1. Timely, if it is wrong, someone will point it out to you immediately. It is not right for people to be right for things. The cost of mistakes is small. This is more like the green light thinking in the learning mentality. To distinguish between "I" and "my view of behavior". I am very good myself, and my behavior and opinions can be changed.庄天(元华)及董兆匡(张国强饰)本为清末名震天下的捉妖天师，风光一时吾人能出其右，然而清末民初时期，社会大倡科学精神，捉妖之术被评议为迂腐无稽，二人被迫徙至广州，天转行当警察，但匡却沉湎於昔日辉煌成就，坚持本行，并设法接近大商人堂(任世官饰)，堂表面是个正当商人，实际上无恶不作，匡得堂倚重後，心性大变，一时财迷心窍，与堂合谋利用僵尸运毒。此事为天所知悉後，大为震惊，无奈念著兄弟之情，遂不予揭发。匡之徒弟小东(陈晓东饰)邂逅堂之女翠玲(谭小环饰)後，惊为天人，展开热烈追求。此时，匡为与已逝的爱人梦(曹众饰)长相厮守，强夺玲的身躯梦还魂，东为救玲，往求天相助，天施法驱走梦的魂魄，并令她永远消失，匡得知後大受打击，从此与天反目，并利用讲僵尸对付天......V-shaped socks are not only beautiful, but also convenient to wear and take off.This is the first sub!8. Protected in the "Phase III"…,可是在他还没高兴多久，一个令人惊讶还有些沉重的消息传来，刘邦立即不这么想了。