(When building and maintaining a local area network, there are always many shortcomings. Eliminating shortcomings and optimizing the system is one of the most basic offices for managing a local area network. The author has been engaged in network management office for eight years. Here are some small experiences that I usually accumulate in the office to share with us, including the perspective of eliminating shortcomings and optimizing functions, and briefly synthesizing some experience and know-how of local area network maintenance and optimization.)