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But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows:Although the recent large-scale DDoS attacks against European anti-spam organization Spamhaus are not as harmful as early rumors claimed, the reason why this incident deserves attention is that they have exposed several of the many fundamental weaknesses of the Internet. One of them is the open DNS parser, which provides an opportunity for an attack called DNS amplification. This attack method specifically means that for every byte the target server sends out, the attacker sends up to 100 bytes of network congestion traffic to these servers.所以，清寒的读书人家那是最好了。唐伯虎八位国色天香的娇妻出场。见到美人眼中含着泪水，当即笑道：别哭，一哭就不好看了。那老大夫连连点头道：如此甚好。