Company has OSPF and 300 router inside the backbone area. how to change design.

Question

Options

• ARoute summarization in the backbone area
• BBreakdown area into smaller nonbackone area
• CAdd virutal link

• A
  3% (1)
• B
  86% (32)
• C
  11% (4)

Explanation

With 300 routers in a single OSPF backbone area (Area 0), every router maintains a complete Link State Database (LSDB) for the entire area and runs the SPF algorithm against it. This creates excessive memory consumption, CPU overhead from frequent SPF recalculations, and high convergence times. The correct solution is to break the large backbone into smaller non-backbone areas (B), connected to a reduced backbone. Each non-backbone area maintains its own smaller LSDB, and Area Border Routers (ABRs) summarize routing information between areas, dramatically reducing LSDB size and SPF scope per router. Route summarization in the backbone (A) helps reduce inter-area route counts but does not address the core problem of having 300 routers in one area sharing full LSA flooding. Adding virtual links (C) is used to connect disconnected areas to Area 0, not to solve scalability issues.

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