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2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.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.It is easier to design a command queue简先生见了忧心如焚，派阿瑛亲自回去见南灵王，于是，一切都顺利起来。不行啊，我不带他来，他便要杀我。