HCIP-Datacom H12-821_V1.0 Exam Questions and Answers PDF

Comprehensive and Detailed In-Depth Explanation:

OSPF-to-BGP route redistribution does not allow modification of MED values directly using a route-policy in Huawei devices.

Instead, MED can be set using a BGP attribute policy, not through the import command .

All other options (B, C, D) are correct :

B → Route-policy can filter imported direct routes .

C → network command does not modify attributes , only announces existing routes.

D → peer command can set Local Preference via route-policy.

???? Reference: Huawei HCIA-Datacom Study Guide, BGP Route Policy and Attribute Modification.

OSPF process IDs are locally significant and do not need to match between routers to form neighbor relationships. The other statements correctly describe the behavior of OSPF multi-instances, making Option C false ​.

 DIS and DR Election

The IS-IS Designated Intermediate System (DIS) is responsible for generating and updating pseudonode LSPs on a broadcast network.

Unlike OSPF DR, the IS-IS DIS does not preempt by default. This behavior avoids unnecessary flapping in the network due to frequent DIS re-elections.

 HCIP-Datacom-Core Reference

The characteristics of DIS and DR behavior are explained in IS-IS network operation chapters​​.

 ACL Matching in Huawei Routers:

Access Control Lists (ACLs) are used to filter packets based on specific criteria, such as source/destination IP, ports, or protocols.

When a packet arrives, the Huawei router processes it against the configured ACL rules to decide whether to permit or deny the packet.