Internet Foundation
Internet (Internet)
The composition of the Internet:
1. Computer (communication, office, entertainment)
two。 The network
Switch: realize the exchange of data, used for data transmission between computers
Router: enables access between internal and external networks, translating private addresses into public addresses (NAT)
DNS: implement the resolution of domain name and IP
For example, www.baidu.com → IP address (119.75.216.20)
IP address: can only be accessed on the same network, consisting of 32-bit binary digits (0,1), 8 bits per segment and converted to decimal
IPV4 addresses are 2 to the 32 (4294967296) maximum: 11111111.11111111.111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 The IP represents the entire network) Class B: 128.0.0.0-191.255.255.255.) Class C: 192.0.0.0-223.255.255.255 D: 224.0.0.0-239.255.255.255 E: 240.0.0-254.255.255. Network segment identification address) (2) Private IP address: free Class A: 10.0.0.0-10.255.255.255 Class B: 172.16.0.0-172.31.255.255 Class C: 192.168.0.0-192.168.255.255 (3) Subnet Mask: determine whether it is in the same network segment Class A: 255.0.0.0 Class B: 255.255.0.0 Class C: 255.255.255.0
Windows sharing files (Note: only folders can be shared by default, and be careful to turn off the firewall)
Create a new folder (save shared data), right-- > share-- > Advanced share (check) Security Protection: default Windows share all disks view share: windows key + R-> cmd-- > net share delete share: windows key + R-> cmd-> net share share name / del Hidden share: $after share name
Visit: windows key + R->\ IP
Windows key + R->\\ IP\ share name Windows key + R->\\ IP\ share name $
Note: three services must be enabled for Windows sharing; key + R-- > cmd-- > services.msc-- > Workstation, Server, Computer Browser, right click on the three services.
