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Huawei H12-821_V1.0 Exam Dumps

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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: 219
Last Updated: August 24, 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

What is the default sending interval of BFD packets?

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Correct Answer: C

The default sending interval for BFD (Bidirectional Forwarding Detection) control packets is 100 milliseconds. This interval ensures rapid detection of link faults, providing fast failover and minimizing downtime in network operations .


Question No. 2

After HSB is configured, the HSB channel fails to be established and cannot back up information on the active device to the standby device. What are the possible causes for this HSB function failure?

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Correct Answer: A, B, D

High-availability Stateful Backup (HSB) ensures synchronization between active and standby devices. If the HSB channel fails to establish, the following causes are possible:

TCP channel not established: The HSB channel relies on a TCP connection. If the TCP session cannot be established, the backup process cannot start.

Mismatched retransmission settings: If the retransmission count and interval for HSB service packets are inconsistent between the two devices, the synchronization process fails.

Incorrect source and destination configurations: If the source IP address and port number on one device do not match the destination IP address and port number on the other, the channel cannot be established.

Option C is incorrect because the priority of the two ACs affects active/standby roles but does not directly impact HSB channel establishment .


Question No. 3

On an OSPF network, interfaces are classified into four types based on link layer protocols. Which of the following types can interfaces on an IS-IS network be classified into based on physical links?

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Correct Answer: A, B

IS-IS Interface Types

IS-IS interfaces are categorized based on physical link characteristics:

Point-to-Point (P2P): Direct connections between two routers.

Broadcast: Shared medium networks where multiple routers communicate.

Incorrect Options

C . P2MP and D. NBMA are not standard interface classifications in IS-IS.

HCIP-Datacom-Core Reference

IS-IS physical link classifications are elaborated in IS-IS link configuration sections.


Question No. 4

When receiving a packet that does not match any session table entry, the firewall discards the packet to prevent external attacks and ensure internal information security.

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Correct Answer: A

When a Huawei firewall receives a packet that does not match any existing session table entry, it discards the packet. This is part of the default firewall policy, which ensures that unrecognized traffic is treated as a potential security risk and blocked. This behavior is vital for preventing unauthorized access and mitigating external attacks. The feature aligns with Huawei's default security strategies as detailed in their firewall operation manuals .


Question No. 5

Which of the following statements regarding the OSPF protocol is false?

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Correct Answer: D

The Link State ID in a Type 3 LSA (Summary LSA) indicates the network or subnet being summarized, not the router ID of an ABR. All other statements accurately describe OSPF functionality, making D the false statement .


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