Port Addressing
=======================

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        **What is Port Addressing?**

        Port addressing is a method used in networking to distinguish between multiple applications or services running on a single device. It uses **port numbers** to identify specific processes.

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        **Why is Port Addressing useful?**

        Port addressing allows multiple network services to operate on the same machine without conflict. It enables precise delivery of data to the correct application.

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        **How does Port Addressing work?**

        Port addressing uses **port numbers** (ranging from 0 to 65535) in combination with IP addresses. When a packet is received, the transport layer uses the destination port to route data to the correct application.

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        **Where is Port Addressing used?**

        Port addressing is used in all **TCP** and **UDP** communications. It is essential for services like HTTP (port 80), HTTPS (443), FTP (21), DNS (53), and others.

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        **Which OSI layer does Port Addressing belong to?**

        Port addressing operates at the **Transport Layer (Layer 4)** of the OSI model, where protocols like TCP and UDP manage end-to-end communication.

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        **Is Port Addressing Windows specific?**

        No, port addressing is part of the transport layer protocols and is supported by all major operating systems, including Windows, Linux, and macOS.

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        **Is Port Addressing Linux specific?**

        No, port addressing is a standard networking concept implemented in all operating systems that support TCP/IP networking.

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        **Which Transport Protocol is used by Port Addressing?**

        Port addressing is used by both **TCP** and **UDP**, which rely on source and destination port numbers to direct traffic to the appropriate applications.

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        **Is Port Addressing using client-server model?**

        Yes, in a client-server model, port addressing helps the client connect to the correct service on the server by targeting a specific port, like port 443 for HTTPS or 22 for SSH.


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        Topics in this section,

                * :ref:`Learnings in this section <Port_Addressing_step1>`

                * :ref:`Terminology <Port_Addressing_step2>`

                * :ref:`Version Info <Port_Addressing_step3>`

                * :ref:`Port_Addressing  Basic Setup on Ubuntu using IPv4 <Port_Addressing_step18>`

                * :ref:`TCP Feature : Port Addressing <Port_Addressing_step4>`
                
                * :ref:`Reference links <Port_Addressing_step17>`

.. _Port_Addressing_step1:

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    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _Port_Addressing_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _Port_Addressing_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info


.. _Port_Addressing_step18:

.. tab-set::

   .. tab-item:: Port_Addressing Basic Setup on Ubuntu using IPv4
       
      * setup

.. _Port_Addressing_step4:

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    .. tab-item:: TCP Feature : Port Addressing

         **Port Addressing - Testcases**

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.. _Port_Addressing_step17:

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    .. tab-item:: Reference links
     
       * Reference links