First, what is a network?
1, the computer network: the "distribution" of different computing systems in various locations, achieved by linking media and network protocol resources aim to share.
2, the computer system: PC, notebook, server, ARM, development board, raspberry pie
3, link media: cable (UTP) (Cheng Cheng white, green, blue and white, white, blue, green, white brown brown)
4, hardware resources : the bandwidth, hard disk, CPU, etc.
5, software resources :( network protocols HTTP HTTPS POP POP3 STMP SSH FTP protocol, etc. 3389 shared printer on Windows)
6, hard disk storage, printers and other resources
Second, the network is used to do?
1, coverage
(1) Local Area Network
(2) MAN
(3) Wide Area Network
2, Dark Web
(1) hacker, professionals (Nora coined MT)
(2) trafficking
(3) drugs, arms
Third, how to use?
1, the minimum configuration of a network (a communication between two hosts)
Through different transmission media
(1) Oriented transmission medium