Definition of Computer Network

Computer NetworkIt refers to connecting multiple computers with independent functions and their external devices with different geographical locations through communication lines in the network operating system, A computer system that manages and coordinates network management software and network communication protocols to share resources and transmit information.

Simply put, a computer network is a set of computers connected by cables, telephone lines, or wireless communications.

Development of Computer NetworksIt has gone through three stages: terminal-oriented Single-level computer network, computer network-to-computer network, and open standardized computer network.

Generally speaking, a computer network is composed of multiple computers (or other computer network devices) connected by transmission media and software physical (or logical. In general, the composition of computer networks includes computers, network operating systems, and transmission media (which can be tangible or intangible, for example, the transmission media of wireless networks is air) and the corresponding application software. InDefinitionIt is very simple ﹕NetworkIs a group of computers connected in a certain form.

The difference between Internet and Intranet: openness. The Internet is open and does not belong to anyone. As long as you can connect to the Internet, you will be one of them, and you will be able to access the resources opened above. In contrast, Intranet is dedicated and non-open. it often exists on a private network, but its structure and service methods and design refer to the Internet mode.

Lan Classification

Currently, there are several common types of LAN: Ethernet, Token & nbsp; ring, FDDI, and asynchronous transmission mode network (ATM.

Ethernet was first created by Xerox (Xerox). In 1980, it was jointly developed by DEC, Intel, and Xerox as a standard. Ethernet is the most widely used LAN, includingStandard Ethernet(10 Mbps ),Fast Ethernet(100 Mbps ),Gigabit Ethernet(1000 Mbps) and10G EthernetAnd comply with the IEEE Standard.