ArsalanAli Lv3Posted 24 Sep 2023 20:51
  
there are multiple reasons, like following
*to reduce the LSA flood (Exchange of routing table)
*You can divide your network in to multiple area (example every campus will be the part of different area and the main campus become the area 0 means backbone area)
*You can configure the failover
*if one area occur the problem, it will not effect other areas

and many other reasons.

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