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Well, in the above example, we have changed the action in the rule from DROP to REJECT, so what is the difference between DROP and REJECT? Literally, DROP means discarded, REJECT means rejected, and REJECT seems to be more determined. Let's launch a ping request from host 146 to host 156 again to see what is different from the previous action of DROP.Specification for single-sided and double-sided printed boards with metallized holesBIM's information model can be used by managers to query, modify and call, synchronously update system information, and better maintain equipment and buildings. The operation and maintenance of buildings usually include monitoring, communication, ventilation, lighting, elevators and other systems. If the above equipment and pipelines fail, they may affect the normal operation of buildings and even cause safety accidents.In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:Belonging Province…,回到越王宫，尽管尹旭还在病榻之上，可暂时还是不能休息。DNS magnification attack