1. Network, Internet, Internet concepts
- Network: a number of nodes and the nodes connected to the link components.
- Node: computer, hubs, switches, routers, etc.
- Internet: between the network by routers interconnected to form a larger coverage-wide computer networks, called the Internet.
- Internet: the world's largest Internet.
[Distinguish between internet and Internet]
the internet is a generic term that refers to a plurality of interconnected computer networks from a network, the communication protocol between the network may be arbitrary, not necessarily using the TCP / IP protocol.
The Internet is a technical term that refers to the current world's largest, open, and there are many specific network of interconnected computer networks become, it uses TCP / IP communication protocol suite as a rule , the predecessor of the United States of ARPANET.
2. The three stages of development of the Internet infrastructure
- The first stage is from a single network to the Internet ARPANET development process.
- The second stage is built Internet tertiary structure (the backbone, regional networks, campus network).
- The third stage is gradually formed the Internet ISP multi-level structure .
[Understanding] ISP
ISP, Internet service providers, Internet service providers, such as China Big Three - Telecom, China Mobile, China Unicom. According to the size of the coverage area served and the number of IP addresses have different, ISP also divided into different levels of ISP: backbone ISP, regional ISP, a local ISP.
3. Composition of the Internet
- Edge portions: of all the hosts connected to the Internet composed, in part directly by a User, used for communication (transmission of data, audio and video) and resource sharing.
- Core components: a large number of networks and routers connecting the network components. This part is serving edge portion (Interconnecting and exchange)
[Understand two major components of the computer]
Subnet resources by the various types of hosts, terminals, peripherals, and other various software resources, is responsible for the entire network of data processing and network resources as well as providing network services to network users. It is the outer layer of the computer network.
Subnetworks are independent of a data communication system by a network node and a communication line consisting of the whole network to bear the data transmission, transfer, processing and transform processing communications, data transfer between the host. It is the inner layer of the computer network.
Communication subnet subnet and resources are interdependent relationship, no communication network subnets can not work without the resources subnets, subnet transmission communication does not make sense, a combination that make up a unified two-tier resource sharing network .