(Part I?? Part II?? Part III?? Part IV?? Part V fundamentals of computer network?? Transmission media and?? Establishment and maintenance of office network?? Tcp/ip protocol family?? Static routing and network equipment management include the development of computer network, basic concepts, basic configuration of Cisco equipment, etc?? Cable, interface, twisted pair production and testing, cable finishing, etc?? Design, wiring, implementation and troubleshooting of office network; Purchase of equipment; Switch principle, ARP protocol, office network access to the Internet, etc?? The concept of protocol layering, osi7 layer model and tcp/ip5 layer model, packet capturing analysis using sniffer software, etc?? Static routing, device management, IOS upgrade, password recovery, etc. Chapter 1?? Chapter 2?? Chapter 3 ~ 5?? Chapter 6?? Chapter 7 ~ 9)