Learn how OSPF area connectivity works when connecting non-backbone areas. Discover the requirements for full connectivity between area 0 and area 2 in this scenario.
Table of Contents
Question
A new site has been added to an OPSF network using area 2. Area 2 is connected only to area 1 of this OSPF network. Area 1 is used to connect area 1 to the backbone area 0. Should you expect full connectivity to the networks located in area 2 from area 0 in this scenario?
A. Yes, by default there will be full connectivity.
B. No, you will need to redistribute the area 2 routes into area 0.
C. No, a virtual link is needed to logically connect area 2 info area 0.
D. Yes, but area 2 will need to be configured as a stub area.
Answer
A. Yes, by default there will be full connectivity.
Explanation
In an OSPF network, as long as there is a path between areas, full connectivity is achieved by default. In this scenario, area 2 is connected to area 1, which in turn is connected to the backbone area 0. OSPF routers in each area exchange link-state advertisements (LSAs) to build a complete topology database. The area border router (ABR) between area 1 and area 0 will summarize the routes from area 2 and advertise them into area 0. Similarly, the ABR will advertise the routes from area 0 into area 1, which will then be propagated to area 2. This allows for full connectivity between all areas without the need for redistribution or virtual links.
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