Port can be a strange term for those of you who are not in the technology industry. So what does Port mean and what it is for, what can it do for you, let’s find out in this article.
Watching: What is a Port
What are ports?
Port is the leading 16 bit protocol (inserted in the header) of each packet in the TCP, UDP protocol, also known as the port port, where separate data sets are specified. Port is a predefined algorithm that every computer needs to have in order to receive and send packets. During operation Port is also converted to the same number of bits of any data code. Simply put, this is like a gate that has the right to let in or not with the data that wants to go in and out of your computer system.
As an important part of keeping the Bitcoin network safe, what is hash value is something you should learn when you want to play Bitcoin.
Need an IP address, you can identify a machine in a network, but if they run with many different services, there must be a way to distinguish them and now you need the Port.
The port helps to prevent and control packets
For example, Server A running the website service, DNS and FTP server, has an IP address of 211,445.026.16. Any other computer that wants to access server A must go to server A’s IP address or domain name. But it needs to know the Port to go to the correct destination of website A, for example, or because it is wrong to go to DNS or FTP of A. This outgoing packet has IP 211.445.026.16 with Port address of 80. Similarly, if machine B wants to go to A’s FTP, at this time, the IP address will still be the same, but the Port will be 21. Machine C wants to access A’s DNS. Port is 53, IP is the same. In fact, applications often hide the Port to reduce the complexity of the TCP/IP protocol.
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What are the functions of the port
?Find out the tasks that the port handles in your host computer system.
Help select news
As an algorithm that all machines need to be registered to use, Port determines only which files are allowed to enter the machine, similar to the files that are allowed to be output from the machine. The bit-port matching check will help you control and select which files are safe and which ones are problematic, thereby denying access.
Enables malicious intrusion protection for the computer
From the selective effect, it is natural that the Port has an ability to resist intrusions into your computer. Viruses, bad files, and jamming information will be removed immediately.
If the Port helps files to be accessed, inserted with the correct port address that matches the beginning of that file bit, what is Port 445 and how does it work with the computer system you know?
Although these are extremely basic functions, but they play a very important role, imagine if the server system lacks a Port, malicious information comes in and out freely and destroys your data.
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Access to FTP server via Port 21
Types of popular ports today
The port has a total of 65535 ports, divided into 3 parts: Well Known Port (WKP) includes ports specified from 0 to 1023, specified for applications such as websites (Port 80), FTP (Port 21), email (Port 25); Registered Port (RP) includes Ports from 1024 to 49151; Dynamic/Private Port (D/PP) includes Ports from 49152 to 65535. According to IANA regulations, WKP and RP must be registered with IANA before use.
20 – TPC – File Transfer – FTP data: allows uploading and downloading data from server21 – TPC – File Transfer – FTP control: When a computer wants to connect to your computer’s FTP service, it will automatically add Port and try to connect to port 21 by default. When the bit ends match port 21 is open for the machine that wants to go to FTP to log in and connect to your server22 – TPC /UDP – SSH Remote Login Protocol: If you run SSH Secure Shell, port 22 is required for SSH users to connect connect to your server.23 – TPC – Telnet: Where you run a Telnet server, this port is required for Te users to connect to your server. Te can be used to test service work on other ports as well. 25 – TPC – Simple Mail Transfer Protocol (SMTP): when mail arrives at your SMTP server, they will try to enter the server via Port 25 by default. 38 – TPC – Route Access Protocol (RAP)42 – TPC -Host Name Server – Microsoft WINS45 – TPC – Message Processing Module (receive)46 – TPC -Message Processing Module (send)50 – TPC – Remote Mail Checking Protocol (RMCP) 66 – TPC – Oracle SQLNET80 – Hyper-Text Transfer Protocol (HTTP): when someone uses your IP address or domain name, the browser will monitor the IP address on port 80 by default for websites, and support HTML and other website files eg ASP – Active Server Pages88- TPC -Trivial File Transfer Protocol (TFTP)110 – TCP UDP – Post Office Protocol (POP) Version 3: you run one machine, users will POP3 (Post Office Protocol) or IMAP4 (Notice Access Protocol) Internet) as prescribed. Among them, POP3 is the best way to access the mailbox.119 – TCP UDP – Network News Transfer Protocol: you run the server for news, users who want to connect to the information will be required to go through port 119 according to default.130 – TCP UDP – Cisco FNATIVE143 – TCP UDP – InteMessage Access Protocol (IMAP) Mail Server: Inte message access protocol is more popular than ever and allows remote use. Therefore, the messages are kept on the server for easy access online, online, offline.161 – TCP UDP – SNMP
Through this article, you can partly understand the basic information, definitions, and functions of Port, and at the same time it is an important factor in your computer system. Be sure to look forward to reading more articles on Bkhost’s blog!