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In the "Learning Massive Open Online Course" section, free video courses are divided into 5 categories, including social law, science, technology, agriculture and medicine, humanities and philosophy, politics and economy, and others, totaling nearly 200 courses. This includes 16 social law courses such as "Operations Research", "Tort Liability Theory" and "Communication Psychology". "Diagnostics of Traditional Chinese Medicine", "Antenna Principle", "Astronomical Exploration" and other 63 science, technology, agriculture and medicine courses, "Nine Lectures on the Essence of Marxist Philosophy Principles", "Guan Zhong's Management Thought of Chinese Famous Phase" and "Five Types of Poetic Life" and other 60 kinds of human history and philosophy courses, 15 kinds of political and economic courses such as "CPC Tax System", "Political Ethics" and "Corporate Finance" and 24 kinds of other courses that have not yet been classified, such as "Self-shaping: Five Elements of Success", "Gem Processing Technology" and "Cosmetic Appreciation and Application".These attacks usually use server resources rather than bandwidth from the server. They can also use the resources of network devices (such as firewalls, intrusion detection systems, and switches) on the periphery of the server. Examples include Smurf attacks (ICMP using broadcast IP spoofed IP), Fraggle attacks (same as Smurf, using UDP only), SYN flooding, dead pings (super large ICMP with the same destination and source IP and port), and many others.在前门把一个管事撞得一歪，问他去哪。他说不让吃零食，你就不吃？我的天啊……尹文倩用手扶额，感觉和自己最好的朋友已经没有办法交流了。