(Building a network is a relatively easy office, but managing a network is a tedious office. Not to mention that the various requests made to you by users will keep you busy, the shortcoming of network failure alone is troublesome enough to manage, because there are too many factors that cause network failure. However, as a network manager, you don't have to lose the courage to manage problems because of this. As long as we classify the shortcomings, there are still rules.)
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