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CCNA Recap: Wide Area Networks

(More like CCENT Recap)




point to point
* can be physical
* can be logical
* typically layer 2
* connect lans to service providers

hub and spoke

spoke
     |
     |
     |
hub ———— spoke
  |
  |
  |
spoke




- cost effective
- could have suboptimal paths
- hub is a single point of failure
- make sure they never become DR or BDR
    - reduce priority to zero


Full Mesh

* redundancy
    * everyone is connected to everyone else
* does not scale well
* optimal pathing
* higher expense
* you could make it partial mesh!

Single homed
- connection to a single ISP

Dual Homed
- you are connected to a single ISP with more than one link

Split Horizon
If you receive information in one interface, don’t send it out that same one.



EMPLOYERS: This is me reviewing information I have been tested on and passed in the ... past.

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