(Chapter I basic knowledge of network In Chapter 2, see more network interfaces and cables Chapter III Ethernet switch foundation Chapter IV LanSwitch equipment Chapter V router foundation and principle Chapter VI introduction of router equipment Chapter 7 network layer foundation and subnet plan Chapter VIII IPX protocol and equipment Chapter 9: see Wan protocols and equipment Chapter 10 routing protocol Chapter XI firewall and equipment Chapter 12 DDR and ISDN equipment Chapter 13 backup base equipment Chapter 14 HSRP agreement and equipment Chapter 15 analysis and handling of common network questions)