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=-=Attackers can use dig query and EDNS0 to carry out efficient DNS amplification attacks. Attackers want the widely existing open DNS parser to send dig query commands, set the udp message size in the opt rr field to a large value, and make the requested source ip address not the target ip address.Repeating your current daily work for 1,000 days will not make you an expert, but will only make you fall deeper into the current situation. Psychologist Anders Erickson's principle of "deliberate practice" has refreshed our understanding of learning and practice, knowledge and skills, 10,000 hours and success. What is more valuable is that the book focuses on explaining how to practice "deliberate practice" in our work and life. As long as it is applied, we will be able to train ourselves to be outstanding in 1,000 days.Create multiple product objects in multiple product families. Q: How? A: Each specific factory creates multiple product objects in a product family, and multiple specific factories can create multiple objects in multiple product families.