(The difficulty of 408 examination lies in the wide range of questions and the ever-changing types of questions. Only by laying a solid foundation can we remain unchanged and deal with all changes. Students of computer unified examination can shift their focus to the above two subjects in the early stage; For so many levels of computer network research, the focus can be on the data link layer and network layer. But the network must be reviewed at last, because the knowledge of the network is many and complex, and there are many points that need to be remembered. In addition, the exam is too basic, and the network score is the lowest.)
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