What is port number in computer network | What is the use of port number | Full Network Port Explain

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What is port number and what is the use of port number in computer networking?
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What is the use of port number?
Port number is a unique ID of protocols available in a computer network. Every protocol in a computer network is having a unique ID which is also known as a port number.
Most protocols in computer networks are having multiple port number which defines different task. for example, DHCP (Dynamic Host Configuration Protocol) is having two port number 67 and 68. where port number 67 is use for server and 68 are assigned to the client PC.

Even POP3 and SMTP are having multiple port number. POP3 port number 110 are use to non encryption connection and port number 995 is use for encryption connection (SSL) on the other hand SMTP port number 25 is use for non encryption connection and port number 465 is use for encryption connection (SSL). This is the basic concept of port number in computer networking.

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