(This is the graduation project I made. I chose this topic because I was participating in network engineer training outside at the time, but when I actually did it myself, it was still very difficult. Send to friends in need. This paper mainly does the following two aspects: First, it introduces the meaning, attributes and future development trend of the campus network, and according to the actual situation in reality, design a complete campus network according to the standardized system method, and A comprehensive comparative analysis of various routing protocols and design models is carried out to select the most practical solution. Second, use DynamipsGUI software and SecureCRT to simulate some networks to realize network interconnection, configure each layer of equipment, and give it in the mode of configuration document. ........)