300-320 Question #520: Real Exam Question with Answer & Explanation

The correct answer is C: 3. Cisco recommends that an OSPF router participate in a maximum of 3 areas. Each area requires its own Link State Database (LSDB) and separate SPF (Shortest Path First) calculations. Belonging to too many areas overloads the router's CPU and memory. The common design is Area 0 (bac

Question

An OSPF router should participate in a maximum of how many areas?

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Explanation

Cisco recommends that an OSPF router participate in a maximum of 3 areas. Each area requires its own Link State Database (LSDB) and separate SPF (Shortest Path First) calculations. Belonging to too many areas overloads the router's CPU and memory. The common design is Area 0 (backbone) plus up to two additional areas, totaling 3. While the protocol doesn't enforce a hard limit, exceeding 3 areas per router is considered a design anti-pattern in Cisco best practices.

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