Headquarters has 3 branch routers and only want one default route sent to the branch routers. What type of area will be configure?

Question

Options

• ANormal Area
• BStub Area
• CTotally stub area
• DNot-so-stubby-area

• A
  6% (2)
• B
  3% (1)
• C
  88% (29)
• D
  3% (1)

Explanation

A Totally Stubby Area (C) is an OSPF area type that blocks both Type 5 External LSAs (from redistributed external routes) and Type 3 Summary LSAs (inter-area routes), allowing only a single default route (injected as a Type 3 LSA by the ABR) to reach routers inside the area. This is exactly what the scenario describes - branch routers only need a single default route pointing back to HQ, not the full routing table. A Normal Area (A) receives all LSA types. A Stub Area (B) blocks Type 5 LSAs but still allows Type 3 summary LSAs, meaning branch routers would receive many inter-area routes. A Not-So-Stubby Area (NSSA, D) allows external routes to be injected locally via Type 7 LSAs and is used when a stub area has its own external routing source (e.g., a branch with a local internet connection).

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