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During a DNS NXDOMIAN flood attack, the DNS server makes multiple domain name queries and its cache is filled with a large number of NXDOMAIN records, resulting in a slow response to DNS resolution requests from normal usersPressing F8 key during startup is the most traditional and commonly used method: turn on the computer power supply, immediately press F8 key on the keyboard after the hardware completes self-checking, and many advanced startup options are listed here. In this security mode, there are several types. Generally speaking, you can choose to enter the common security mode. In addition to this most commonly used method, you can also start the system in "safe mode" by holding down the Ctrl key when the computer starts.In the morning when she got up to cook, he went to bed.Wait for the unencrypted version.For more than 20 years, this seemingly minor "negligence" has brought unexpected difficulties to the lives of more than 15 million ethnic minority compatriots.