One, windows service
The role of windows service: The
service determines whether some functions of the computer are enabled.
Different services correspond to different functions
. The services provided by the computer can effectively realize resource sharing.
Common services:
web service, dns service, dhcp service, mail service, telnet service , Ssh service, smb service
2. Port
1. There are two types of ports: famous ports and dynamic ports
Well-known ports are well-known port numbers, ranging from 0 to 1023. These port numbers are generally assigned to some services. For example, port 21 is assigned to ftp service, port 25 is assigned to SMTP (Simple Mail Transfer Protocol) service, and port 80 is assigned to HTTP Services, port 135 is allocated to RPC (Remote Procedure Call) services and so on.
Dynamic ports range from 1024 to 65535. These port numbers are generally not fixedly assigned to a certain service, which means that many services can use these ports. As long as the running program requests the system to access the network, the system can use these One of the port numbers is allocated for use by the program.
2. Common ports:
HTTPCommonly used port number of protocol proxy server: 80/8080/3128/8081/9080
FTP(File transfer) Protocol server commonly used port number: 21
Telnet(Remote login) Protocol proxy server commonly used port: 23
TFTP(Trivial File Transfer Protocol) simple file transfer protocol, the default port number is 69/udp
SSH(Secure login), SCP (file transfer), port redirection, the default port number is 22/tcp
SMTP(Simple Mail Transfer Protocol (E-mail)) Simple Mail Transfer Protocol, the default port number is 25/tcp,
POP3(Post Office Protocol (E-mail)), the default port number is 110/tcp
Tomcat, The default port number is 8080
Win2003 remote login, The default port number is 3389
OracleDatabase, the default port number is 1521
MS SQL*serverDatabase server, the default port number is 1433/tcp 1433/udp
QQThe default port number is 1080/udp
Third, the registration form
The registry is a core database in the windows operating system, which stores various parameters, which directly controls the startup of windows, the loading of hardware drivers and the operation of some windows applications, thus playing a core role in the entire system. These functions include software and hardware related configuration and status information, such as the initial conditions of the application and the resource manager shell, preferences and uninstall data stored in the registry. The settings and various permissions of the entire system of networked computers, the association of file extensions with application programs, hardware descriptions, status and attributes, performance records and other low-level system status information, and other data.
Four, common dos commands
| command | effect |
|---|---|
| color | Change cmd color |
| ping | -t (long ping) -l (file size) ip |
| ipconfig /all | (Detailed information) View ip address |
| ipconfig /release | Release ip |
| ipconfig /renew | Get ip again |
| systeminfo | Get system details |
| arp -a | Get the local area network arp cache table |
| net view | Get the names of other computers in the current LAN |
| shutdown -s -t 180 -c | "You are hacked, the system will shut down immediately!" |
| msg administrator “hello” | Send to user information |
| to you | View current directory information |
| cd | Switch current disk directory |
| D: | Switch disk |
| start www.baidu.com | open the Web page |
| start qwe.txt | Open qwe.txt |
| copy 1.txt C: | Copy files |
| of the | Delete Files |
| cls | Clear screen |
| copy con 123.txt | Create a file |
| md directory name | Create a directory |
| rd directory name | Delete folder |
| type 123.txt | View file content |
| ren source file new file | Rename folder |
| move | Move files |
| tree | Tree display folder structure |
| net use K: \192.168.1.1\cd$ | Map disk |
| net start | Check which services are enabled |
| net start telnet | Open service |
| net stop telnet | Close service |
| net user username password/add | Create user |
| netstat -ano | View port number |
| tasklist /im process ID/service name | View process number |
| netstat -ano | findstr “8080” |
| netsh | Network tools |
The .bat batch file is a combined file of dos commands. The commands written in the batch file will be executed one by one.
Create a new batch file
When saving a new text file, change the suffix to bat
or use the command
copy con 123.bat
net user cr 123 /add
net localgroup administrator cr /add
Ctrl+z and press
Enter