Câu 40: H12-821: HCIP-Datacom-Core Technology V1.0

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? (Choose all that apply.)

1. A. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area. — đáp án hiện tại
2. B. Inter-area routes need to be forwarded through area 0. — đáp án hiện tại
3. C. Inter-area routes cannot be directly transmitted between non-backbone areas.
4. D. All non-backbone areas must be directly connected to area 0. — đáp án hiện tại