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H12-821_V1.0 Pack
Vendor: Huawei
Exam Code: H12-821_V1.0
Exam Name: HCIP-Datacom-Core Technology V1.0
Exam Questions: 394
Last Updated: October 7, 2026
Related Certifications: Huawei Certified ICT Professional, HCIP Datacom
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Free Huawei H12-821_V1.0 Exam Actual Questions

Question No. 1

On the network shown in the following figure, the management VLAN is VLAN 10, and the AP is configured to obtain an IP address on the network segment 10.1.1.0/24 through DHCP. The AP, AC, and AR function as the DHCP client, DHCP relay agent, and DHCP server, respectively. Which of the following configurations for the DHCP relay agent and DHCP server are correct?

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Correct Answer: A, B

Option A correctly configures the DHCP relay agent (AC) to forward requests to the DHCP server using VLAN 10. Option B correctly configures the DHCP server (AR) with the correct IP pool (10.1.1.0/24), gateway, and excluded IP addresses. The static route to 10.1.1.0 through 172.21.1.1 ensures proper routing .

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Question No. 2

Regarding the route-policy set-cost configuration below, which of the following statements is true?

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Correct Answer: A

The route-policy configuration specifies that node 10 matches the IP prefix 11.1.0.0/16 and applies a cost of 300 to this route. Once a route matches a node, it is no longer processed by subsequent nodes, making option D incorrect. Option B is also incorrect because only specific matching routes have their costs changed .


Question No. 3

BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.

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Correct Answer: B

BGP Route Flapping and Mitigation

While route flapping is a concern in large-scale networks, BGP employs mechanisms such as Route Dampening to mitigate its impact. Route dampening suppresses frequently flapping routes for a period of time to reduce resource consumption and network instability.

Therefore, it is incorrect to state that the issue cannot be resolved in BGP.

HCIP-Datacom-Core Reference

The mechanism of route dampening is detailed in the BGP optimization chapters.


Question No. 4

In PIM-DM, which of the following processes are involved in SPT establishment?

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Correct Answer: A, B, C

In PIM-DM (Protocol Independent Multicast - Dense Mode), the SPT (Shortest Path Tree) establishment process involves flooding to propagate multicast traffic across the network, prune messages to stop sending multicast traffic to unwanted interfaces, and graft messages to re-establish forwarding when needed. State-refresh is not directly involved in SPT establishment but helps maintain the prune state .


Question No. 5

IGMP has three versions. Different versions support different features. Which of the following features is supported by all versions?

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Correct Answer: C

Comprehensive and Detailed Step-by-Step

Overview of IGMP Versions:

IGMPv1: The simplest version, supports basic group membership management using Report messages but lacks Leave messages.

IGMPv2: Adds features like Leave messages and Group-Specific Queries.

IGMPv3: Supports specifying multicast sources for Source-Specific Multicast (SSM).

Feature Supported by All Versions:

Report messages are fundamental to IGMP functionality and are supported in all three versions.

Features Not Supported by All Versions:

Group-Specific Queries (A): Supported in IGMPv2 and IGMPv3.

Leave Messages (B): Introduced in IGMPv2.

Specifying Multicast Sources (D): Introduced in IGMPv3.


HCIA-Datacom Study Guide, Chapter: IGMP Overview

Huawei Multicast Protocol Details

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