Complete H12-821_V1.0 Huawei Materials

[: HCIP-Datacom-Core Technology Training Material (OSPF Basics and Advanced Concepts)​​.,  Analysis of Each Statement:, A. Inter-area routes cannot be directly transmitted between non-backbone areas.This statement is TRUE. OSPF mandates that all inter-area routing must pass through Area 0. Direct inter-area route exchanges between two non-backbone areas are not allowed to prevent loops., Reference: HCIP-Datacom-Core Technology Training Material (Inter-Area Routing Mechanisms)​., B. All non-backbone areas must be directly connected to area 0.This statement is TRUE. OSPF requires every non-backbone area to connect directly to Area 0 to facilitate loop-free inter-area routing. Virtual links may be configured in exceptional cases where direct connection is not possible., Reference: HCIP-Datacom-Core Technology Training Material (OSPF Backbone and Area Connectivity)​​., C. Inter-area routes need to be forwarded through area 0.This statement is TRUE. All inter-area traffic must traverse Area 0 to ensure hierarchical routing and loop prevention. This rule is a core design principle of OSPF., Reference: HCIP-Datacom-Core Technology Training Material (Routing Control and Loop Prevention in OSPF)​​., D. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.This statement is TRUE. OSPF explicitly prohibits an ABR from injecting Type 3 LSAs describing a route into the same area where the route originates. This mechanism prevents routing loops within an area., Reference: HCIP-Datacom Advanced Routing & Switching Technology (OSPF LSA Types and ABR Behavior)​.,  Conclusion:All options (A, B, C, D) are correct. OSPF enforces a robust loop prevention mechanism through hierarchical routing, mandatory traversal via Area 0, and strict rules on LSA propagation by ABRs. This ensures reliable and loop-free inter-area routing in OSPF networks., ]