IPv6 Addressing - CIDR (Classless Inter-Domain Routing)
========================================================

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        **What is CIDR?**

        CIDR (Classless Inter-Domain Routing) is a method for allocating IP addresses and routing IP packets, replacing the older class-based system by using variable-length subnet masking (VLSM).

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        **Why is CIDR useful?**

        CIDR allows for more efficient allocation of IP addresses and helps reduce routing table size by enabling route aggregation (supernetting).

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        **How it works?**

        CIDR uses a suffix (e.g., /24) to indicate how many bits are used for the network portion of the address. This allows flexible subnetting and efficient IP space utilization.

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        **Where is CIDR used?**

        CIDR is used in IP address allocation by ISPs, routing within and between organizations, and internet backbone routing to aggregate prefixes.

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        **Which OSI layer does this protocol belong to?**

        CIDR operates at the Network Layer (Layer 3) as it deals with IP addressing and routing.

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        **Is CIDR Windows specific?**

        No, CIDR is not Windows specific. It is a general IP addressing method supported by all operating systems.

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        **Is CIDR Linux specific?**

        No, CIDR is not Linux specific. It is supported universally across all platforms that use IP networking.

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        **Which Transport Protocol is used by CIDR?**

        CIDR is not tied to any transport protocol. It affects IP routing, which works with both TCP and UDP, among others.

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        **Which Port is used by CIDR?**

        CIDR does not use any ports. It is a method of IP address representation and routing, not a service or application.

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        **Is CIDR using client-server model?**

        No, CIDR is not a communication protocol but an addressing scheme. It does not follow the client-server model.

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        Topics in this section,

                * :ref:`Learnings in this section <CIDR_step1>`

                * :ref:`Terminology <CIDR_step2>`

                * :ref:`Version Info <CIDR_step3>`

                * :ref:`CIDR Version&IEEE Details <CIDR_step5>`

                * :ref:`CIDR Basic Setup on Ubuntu using IPv4 <CIDR_step18>`

                * :ref:`CIDR Basic Setup on Ubuntu using IPv6 <CIDR_step19>`

                * :ref:`CIDR Protocol Packet Details <CIDR_step6>`

                * :ref:`CIDR Usecases <CIDR_step7>`

                * :ref:`CIDR Basic Features <CIDR_step8>`
                    
                * :ref:`Reference links <CIDR_step17>`


.. _CIDR_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _CIDR_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _CIDR_step3:

.. tab-set::

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


.. _CIDR_step5:

.. tab-set::

    .. tab-item:: CIDR Version&RFC Details

        * rfc details

.. _CIDR_step18:

.. tab-set::

    .. tab-item:: CIDR Basic Setup on Ubuntu using IPv4

       * setup

.. _CIDR_step19:

.. tab-set::
  
   .. tab-item:: CIDR Basic Setup on Ubuntu using IPv6

     * setup
       
.. _CIDR_step6:

.. tab-set::

    .. tab-item:: CIDR Protocol Packet Details

        * packet details
       


.. _CIDR_step7:

.. tab-set::

    .. tab-item:: CIDR Usecases

       * usecases
        
        

.. _CIDR_step8:

.. tab-set::

    .. tab-item:: CIDR Basic Features
    
        * features 



.. _CIDR_step17:

.. tab-set::

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