JNCIA Question of the Week #2 – OSPF Area 0

JNCIA Question of the Week #2

Another simple question this week, but vital nonetheless. I’ll avoid asking for a configuration example, though if you would like to provide one, feel free.

Q:

In the dynamic routing protocol OSPF, what is the purpose and/or importance of Area 0?

[edit]

A:

In OSPF, Area 0 is also known as the backbone area. In single-area configurations, the single area must be area 0. In multi-area OSPF, Area 0 serves as the backbone. All traffic destined for non-Area-0 areas must pass through Area 0. Therefore, all areas must have a way to reach Area 0 in a multi-area OSPF configuration.

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