Port

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Setting transport protocols TCP and UDP, a two-byte number, added to the IP address, and specifies the application protocol or application that addressed packets of data. Program-daemon or service "listens" to the port, and takes the data from it.

All standard application layer protocols are associated with certain ports, the most used: HTTP-80, 443 HTTPS, FTP, SMTP, 21-25, 110 (POP3), IMAP, DNS, 143-53.


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