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CCDA Notes : cont..

7. Hierarchical layer model:

1.      Core layer: Designed for high availability and redundancy. Core layer is the high-speed switching backbone of any network. The core layer has the following characteristics:

                                                              i.      High reliability

                                                             ii.      Adapt to changes quickly

                                                           iii.      Lower latency

2.      Distribution layer: Address summarization and media translation are applied in the distribution layer. Distribution layer lies in between the Core layer and Access layer.  It usually addresses the following:

                                                              i.      Security

                                                             ii.      Access Control Lists

                                                           iii.      Route Summarization

                                                          iv.      Media translation

3.      Access layer: The access layer consists of the remote office sites using ISDN, Frame Relay etc. Local area networks segments are also part of the access layer.

 


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