Which statements about OSPF stub areas are true? (Choose two.)

Question

Options

• AOSPF stub areas such as stubby or totally stubby, when used at the spokes sites in a dual-hub
• BOSPF stub areas such as stubby or totally stubby, when used at the spoke's sites in dual-hub
• COSPF stub areas such as totally stubby, when used at the spoke's sites in dual-hub topology,
• DOSPF stub areas such as totally stubby, when used at the spoke's sites in dual-hub topology,

• A
  70% (37)
• B
  19% (10)
• D
  11% (6)

Explanation

In a dual-hub DMVPN topology, OSPF stub area behavior has important implications. Option A is correct: stubby (stub) areas at spoke sites in dual-hub topologies can cause suboptimal routing because spokes rely on a default route injected by the ABR hub; if traffic must reach the second hub or its connected networks, the default route may not provide the most efficient path. Option C is correct: totally stubby areas at spoke sites in dual-hub topologies can cause a connectivity failure if the primary hub (ABR) goes down, because totally stubby areas block both external (Type 5) and inter-area (Type 3) LSAs - the spoke has no routing information to reach the second hub, leaving it dependent solely on the default route from the failed hub. Options B and D (the truncated alternatives) represent incorrect or less accurate descriptions of these behaviors.

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