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So what is a port and how does it work?

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Well, in computer networks, hardware connections are terminated, physically wired or wireless.

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In software, a port within an operating system is a logical structure that identifies software specific

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process or service.

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The ports are identified by 16 bit long numbers of each protocol and address combination.

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The most common protocols that use port numbers are the Transmission Control Protocol TCP and the User

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Data Graham Protocol UDP.

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Now, the port number is always associated with a host IP address and its communication protocol type.

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Completes the destination or source network, address a message.

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And in uncertain port numbers are used for specific services, for example, Port Haiti is used by GDP

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or at 443 is used by HTTPS protocol.

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So then this way, the package can be easily transmitted to the running application.

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The most commonly used sports are sports one through 10, 24.

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And other ports can be specified to a particular application.

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The most used default ports.

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So below are the most commonly used default ports and the names of the services that use them.

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And it's important to remember these ports know them well.

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Is because we can understand what the systems are in the target network when we're scanning, so according

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to the port scan results, we can plan the next step.

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Or if there are services that we know are used within the target network, we can scan directly for

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the services and then finish the scanning process without getting caught in the security systems.

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So 421 is open FTP services available.

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And for 53, is open DNS services available.

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If Port 110 is open, there is an SMTP service, which means that mail service is up and running.

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FTP is 21 as H 22.

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Telnet is always 23.

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SMTP 25.

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DNS UDP 53.

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HDP, A-T.

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Pop three 110 net bios one three nine.

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IMAP 143, S&P UDP one six one.

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SMB, Microsoft, DDP for four or five.

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R.S. age five one for VMware, nine 02.

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Ms.

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Escudo, one, four, three, three.

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Oracle DBI 15 21, Maisky well, 33 06, Redzepi 33, 89, the ANC fifty nine hundred.

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Proxy application servers, AT&T and 1881.