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There are Three Types:

i. Internal router: An internal router has all the interfaces in the same area. All internal routers maintain same link state databases.

ii. Backbone router: Backbone routers reside on the perimeter of Area 0, with at least one interface connected to backbone (Area 0).

iii. Area Border Router (ABR): ABRs are routers that have interfaces attached to multiple areas.

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Posted by kenhaulotte