2. Introduction of WAN connection: Widespread broadband access methods, such as ADSL and Cable Moden, are added, and how to use these devices to build a network and how to apply them in the network environment is briefly introduced.
3. Introduction of network transmission media: specifically introduce LAN media, WAN media and connections. How to wire and connect LAN, such as PC and HUB, switch and HUB, switch and switch, and how to connect with what transmission medium. WAN connection involves synchronous serial line, asynchronous serial line and five kinds of serial lines supported by CISCO, as well as the equipment provided by telecom terminals during the connection.
4. Introduce the function of the switch: briefly understand the basic working principle of the switch and its main role in the switching network.
5.TCP/IP protocol structure and several important protocols, introduces the five-layer protocol of TCP/IP and the working mechanism of each layer. Such as OSI seven-layer protocol, IP, ICMP, ARP, RARP, DHCP and so on. It is worth mentioning the OSI layer 7 protocol. The new textbook no longer regards OSI layer 7 protocol as an independent chapter, but introduces OSI layer 7 protocol and their corresponding relationship with TCP/IP chapter.
6.6 Introduction. IP addressing and routing. How to divide network segments in small and medium-sized networks, how to correspond VLAN and subnet, and some operations of subnet division. This involves the conversion between binary and hexadecimal.
7. WAN technology and protocol: Introduce PPP protocol, WAN connection mode, private line connection, circuit switching, frame relay, X.25, ATM, ISDN and dialing.
8. IOS operations involving Cisco. Such as how to start switches, routers and simple configuration.
9. Manage a simple network environment. This paper introduces the application of network management tools such as CPP and Telnet. I hope it helps you.