Port Numbers In Computer Networks
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A port is an endpoint of communication in an operating system. While the term is also used for female connectors on hardware devices, in software it is a logical construct that identifies a specific process or a type of network service.
When referring to a network or to the Internet, a software or network port is a location where information is sent. For example, port 80 is the HTTP network port. A listing of commonly known and used ports can also be found on the below listing.
18 – MSP (Message Send Protocol).
20 - FTP (File Transfer Protocol) for data transfer.
21 – FTP (File Transfer Protocol) for data control.
23 – Telnet.
22 – SSH - Remote Login Protocol.
25 - SMTP (Simple Mail Transfer Protocol) for is used for sending mails.
53 – DNS (Domain Name System).
67 – DHCP (Dynamic Host Configuration Protocol) for sending data to the server – Bootps.
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