(1 Background 12 Introduction 13 Requirement analysis of local area network in dormitory 13.1 Requirement analysis of topology structure 13.2 Analysis of data transmission requirements: 23.3 Analysis of development requirements: 23.4 Analysis of performance requirements: 23.5 Analysis of usage requirements: 33.6 Construction goals and principles 34 Design requirements of LAN 44.1 Design principles: 44.2 Quality and cost matching principles 44.3 What is a local area network: 45 Scheme analysis 56 Network facilities 56.1 Network equipment 56.2 Operating system 56.3 Protocols 56.4 LAN networking principles 67 Network design 67.1 Network design 67.2 Bus topology: 67.3 Star topology : 77.4 LAN networking topology 77.5 IP address design 88 Equipment selection 98.1 Equipment selection principles 98.2 Equipment selection 99 Network cable behavior and precautions 1110 LAN establishment steps 1311 Dormitory LAN daily maintenance 911.1 How to remove the file sharing restrictions of Windows XP system 911.2 Solve IP Address conflict 1012 Virus prevention 12.1 Choose antivirus software 1012.2 Use removable storage devices carefully 10 Conclusion 10 Acknowledgements 11 References 11)