H12-821_V1.0 Exam Dumps | On an OSPF network, if a router functions as an ABR, the router must also be a BR.

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Question 58/107

On an OSPF network, if a router functions as an ABR, the router must also be a BR.

A. TRUE

B. FALSE

Correct Answer: B

Comprehensive and Detailed in-depth Step-by-Step Explanation:To answer this question, we need to understand the roles of OSPF routers:
* Area Border Router (ABR):
* An ABR is a router that connects multiple OSPF areas. It has at least one interface in the backbone area (Area 0) and one or more interfaces in other OSPF areas.
* The ABR performs summarization between areas and propagates routing information between them.
* Backup Router (BR):
* The term "BR" does not exist in OSPF terminology. Instead, OSPF uses the term "Backup Designated Router (BDR)." The BDR is a backup to the Designated Router (DR) in a specific OSPF broadcast or NBMA (Non-Broadcast Multi-Access) network. The BDR takes over the DR's responsibilities if the DR fails.
Key Clarification:
* An ABR is related to the hierarchical structure of OSPF areas and is not tied to the DR/BDR election process.
* A router can function as an ABR without ever being a DR or BDR, as these are separate roles.
Therefore, the statement that an ABR must also be a BR is FALSE.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF Fundamentals".
* RFC 2328 - OSPF Version 2.
* Huawei OSPF Configuration Guide.

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