H12-821_V1.0 Exam Dumps | On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between

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Question 75/107

On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

A. Inter-area routes cannot be directly transmitted between non-backbone areas.

B. All non-backbone areas must be directly connected to area 0.

C. Inter-area routes need to be forwarded through area 0.

D. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.

Correct Answer: A,B,C,D

OSPF Area Design and Loop Prevention:OSPF uses a hierarchical structure with areas to improve scalability and efficiency. Area 0, the backbone area, plays a crucial role in ensuring loop-free route distribution between areas. The following mechanisms are key to preventing routing loops:
* Strict adherence to hierarchical area design.
* Prohibition of direct inter-area route exchanges between non-backbone areas.

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