软硬件系统编程PPT (26).pdf

Computer Network Contents 1 About Computer Network 2 Network Architecture and Protocol 3 Internet 4 Addresses on the Internet 5 Internet Application 01 Lecture 28 01 About Computer Network About Computer Network 01. What is 02. History 03. Classification Computer Network 01. What is Computer Network ◆ The network in our lives? 01. What is Computer Network ◆ Computer network and our life 01. What is Computer Network ◆ Computer network refers to a computer system that connects autonomous computers located in different geographical locations through communication lines to achieve resource sharing and information transmission. ① Autonomous ( Intelligent Terminal） ② Communication lines ③ Resource sharing and Information transmission 02. Introduction: Brief History 1 ◆ The stage of computer interconnection, 1960s An on-line system ◆Computer technology + communication technology centered on a single host ◆Terminal + telephone communication line + computer 2 ◆The stage of computer interconnection, mid-1960s The emergence of packet- ◆ Packet switching technology s switched networks e ◆ Two-level network concept: communication subnet + resource subnet g a t S 3 ◆Computer network interconnection stage, 1970s 4 network structure system ◆Network interconnection standardization ◆Standardization ：OSI/RM ，TCP/IP 4 ◆International Internet Stag