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The main target of link attacks is the link bandwidth resources on the backbone network, and the attack process is roughly as followsLaunch of new products or functions: In essence, adding functions will open up new attack areas for attackers, which is conducive to their quick exploration. This is why it is necessary (but difficult) to provide zero-day defense when new products are released.莫说你王家，就说本朝的太祖皇帝，原本也只是一个打铁的。怕来不及。Reflection attack is also called amplification attack. This kind of attack is mainly based on UDP protocol. Common attack types include NTP, DNS, etc. Generally, the traffic of request response is much larger than the traffic of request itself. Attackers can create large-scale traffic sources with small traffic bandwidth through the characteristic that traffic is enlarged, thus launching attacks on targets. Reflective attacks are not strictly a kind of attacks. They only use the business characteristics of certain services to launch Flood attacks at a lower cost. The detailed schematic diagram is as follows: