What does ftp mean in Chinese?
ftp stands for File Transfer Protocol, which is a set of standard protocols for file transfer on the network, using client or server mode. It belongs to the application layer of the network transfer protocol.
Through the FTP protocol, we can perform file upload (Upload) or download (Download) actions with the FTP server on the Internet.
FTP is an 8-bit client-server protocol that can operate on any type of file without further processing, just like MIME or Unicode. However, FTP has extremely high latency, which means that the time between starting the request and receiving the required data for the first time will be very long; and some lengthy login processes must be performed from time to time.
FTP mode
FTP supports two modes: Standard (PORT mode, active mode), Passive (PASV, passive mode).
Active mode:
The FTP client first establishes a connection with the server's TCP 21 port to send commands. When the client needs to receive data, it uses this channel. Send PORT command. The PORT command contains the port used by the client to receive data. When transmitting data, the server connects to the client's designated port through its own TCP 20 port to send data. The FTP server must establish a new connection with the client to transfer data.
Passive mode:
Establishing a control channel is similar to active mode, but the Pasv command is sent after the connection is established. After receiving the Pasv command, the server opens a temporary port (the port number is greater than 1023 and less than 65535) and notifies the client of the request to transmit data on this port. The client connects to this port of the FTP server, and then the FTP server will transmit data through this port.
The default port of FTP
By default, the FTP protocol uses two TCP ports, 20 and 21, of which 20 is used Transmit data, 21 is used to transmit control information. However, whether to use 20 as the port for transmitting data is related to the transmission mode used by FTP.
If active mode is used, the data transmission port is 20; if passive mode is used, the final port to be used must be decided through negotiation between the server and the client.
The above is the detailed content of What does ftp mean in Chinese?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1387
52
How to set up nginx reverse proxy ftp server
May 17, 2023 am 09:31 AM
1. Install nginx 2. Install vsftpd 3. Modify the nginx configuration file nginx.conf 3.1 Add the ftp user userftpuser in the first line; 3.2 Configure the relevant path server{ listen80; #nginx proxy port server_namelocalhost; #ftp server address location/images{root /home/ftpuser; #The absolute path of the folder of the proxy ftp server indexftpuser; #Set the welcome page
Using FTP in Go: A Complete Guide
Jun 17, 2023 pm 06:31 PM
With the rapid development of the Internet, File Transfer Protocol (FTP) has always been an important file transfer method. In Go language, using FTP to transfer files may be a need of many developers. However, maybe many people don't know how to use FTP in Go language. In this article, we will explore how to use FTP in Go language, from connecting to FTP server to file transfer, and how to handle errors and exceptions. Create FTP connection In Go language, we can use the standard "net" package to connect to FTP
PHP and FTP: realizing file sharing among multiple departments in website development
Jul 28, 2023 pm 01:01 PM
PHP and FTP: Achieve file sharing among multiple departments in website development. With the development of the Internet, more and more companies are beginning to use website platforms for information release and business promotion. However, the problem that arises is how to achieve file sharing and collaboration among multiple departments. In this case, PHP and FTP become one of the most commonly used solutions. This article will introduce how to use PHP and FTP to achieve file sharing among multiple departments in website development. 1. Introduction to FTP FTP (FileTransferPr
What are the ftp commands under linux?
Mar 21, 2023 am 09:59 AM
The ftp commands under Linux include: 1. ftp command; 2. close command; 3. disconnect command; 4. open command; 5. user command; 6. account command; 7. bye command; 8. quit command; 9. help command ;10. rhelp command; 11. ascii command; 12. binary/bi command; 13. bell command, etc.
How to compare directories and files on an FTP server via PHP
Jul 28, 2023 pm 02:09 PM
How to compare directories and files on an FTP server through PHP In web development, sometimes we need to compare local files with files on the FTP server to ensure consistency between the two. PHP provides some functions and classes to implement this functionality. This article will introduce how to use PHP to compare directories and files on an FTP server, and provide relevant code examples. First, we need to connect to the FTP server. PHP provides the ftp_connect() function to establish an FTP server
What does linux ftp 530 mean?
Mar 14, 2023 am 10:16 AM
linux ftp530 means linux ftp login error 530. The solution is: 1. Check "cat /etc/shells" to see if your user's home directory and login shell are there. If not, add them; 2. Check "/var /log/secure" file and reset the password expiration time.
How to add/delete FTP users and set permissions in Linux
May 12, 2023 pm 08:46 PM
1. Environment: ftp is vsftp. The username is set to test. The restricted path is /home/test2. Create a user: under the root user: useradd-d/home/testtest#Add user test, and set the home directory of the test user to /home/testpasswdtest#Set a password for the test user3. Change the corresponding permission settings of the user: 1.usermod-s/sbin/nologintest#Limit user test cannot telnet, only ftp2.usermod-s/bin/bashtest#Return to normal for user test 3.usermod-d
How to implement FTP file upload progress bar using PHP
Jul 30, 2023 pm 06:51 PM
How to use PHP to implement FTP file upload progress bar 1. Background introduction In website development, file upload is a common function. For the upload of large files, in order to improve the user experience, we often need to display an upload progress bar to the user to let the user know the file upload process. This article will introduce how to use PHP to implement the FTP file upload progress bar function. 2. The basic idea of implementing the progress bar of FTP file upload. The progress bar of FTP file upload is usually calculated by calculating the size of the uploaded file and the size of the uploaded file.