软硬件系统编程PPT (32).pdf

01 Lecture 33 01 Content Review 1 About Computer Network Contents 2 Network Architecture and Protocol 3 Internet 4 Addresses on the Internet 5 Internet Application Part 1 About Computer Network – What is Computer Network? • Computer interconnection system for the purpose of sharing resources and information transformation. – Brief History • Terminal Network → Computer Interconnect → Network Interconnect → Internet (Global Internet) – Classification • Scale • Medium • Topology • Other Part 2 Network Architecture and Protocol – Protocol • The rules and conventions of the two parties of the communication regarding the format of the transmitted information, the meaning of the control information, and how to operate in the process of information transmission. – Architecture • Layering • Peer Layer、Peer entity、Interface、Service – Typical Reference model • OSI/RM （7）、TCP/IP （4） Part 3 Internet – The structure and composition of the Internet • A global Internet network using TCP/IP protocol • Networks are interconnected through routers • The Internet is composed of the interconnected network of the core part and a large number of hosts in the peripheral part – Internet data transmission • Connection-oriented: TCP, providing reliable (guaranteed) transmission services-making calls. • Connectionless: UDP, providing unreliable (best effort) transmission service-mailing. Part 4 Addresses on the Internet – Domain name •