350-401 Question 433
Single answerAn organization is designing its OSPF network and has the following requirements:
- Minimize the size of the routing table in certain areas.
- Ensure that some areas only receive a default route instead of the full routing information from other areas.
Which OSPF area type should be used to meet these requirements?
- A
Backbone Area (Area 0)
- B
Stub Area
- C
Not-So-Stubby Area (NSSA)
- D
Totally Stubby Area
Show answer and explanation
Correct answer: D
Explanation
The scenario specifies the need to minimize routing table size and restrict the area to receiving only a default route. A Totally Stubby Area is the most appropriate OSPF area type for achieving this, as it suppresses both external and inter-area routes, replacing them with a single default route. This design is ideal for areas requiring simplified routing and reduced overhead.
- A. Incorrect.
Backbone Area (Area 0) is the core of an OSPF network and cannot minimize routing information as described in the scenario. It is not intended for reducing routing table size.
- B. Incorrect.
Stub Area reduces routing information by blocking external routes, but it still allows inter-area routes, which does not fully meet the requirement of only receiving a default route.
- C. Incorrect.
Not-So-Stubby Area (NSSA) allows external routes to be advertised within the area while also reducing some routing information, but it does not explicitly ensure that the area receives only a default route.
- D. Correct.
Totally Stubby Area is designed to minimize routing table size by blocking both external and inter-area routes, ensuring that the area only receives a default route from the backbone. This fully meets the requirements described.