The HCIP-Datacom-Core Technology V1.0 (H12-821_V1.0)

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H12-821_V1.0 Exam Dumps

Exam Code: H12-821_V1.0
Vendor: Huawei
Certifications: HCIP-Datacom
Exam Name: HCIP-Datacom-Core Technology V1.0
Updated: Aug 7, 2026 Free Updates: 90 days Total Questions: 346 Try Free Demo

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In 2026, Huawei uses variable topologies. Basic dumps will fail you.

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Scenario Mastery	Blind Memorization	Conceptual Logic & Troubleshooting
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Coverage of Official Huawei H12-821_V1.0 Exam Domains

Our curriculum is meticulously mapped to the Huawei official blueprint.

OSPF & IS-IS Advanced Routing (22%)

The "Intra-Domain" foundation. Master the advanced mechanics of OSPFv2/v3 and IS-IS (Intermediate System to Intermediate System). Focus on multi-area design, LSA types, and route summarization. In 2026, this domain emphasizes fast convergence techniques like LFA (Loop-Free Alternate) and OSPF/IS-IS extensions required for Segment Routing.

BGP Path Selection & Optimization (20%)

The "Inter-Domain" engine. Master the BGP (Border Gateway Protocol) attributes and path selection process. Focus on Route Reflectors, Confederations, and advanced community attributes. Learn to design resilient BGP policies for multi-homed enterprise gateways, ensuring optimal ingress and egress traffic flow while preventing the creation of transit AS scenarios.

Network Reliability & Routing Control (15%)

The "Stability" layer. Master the implementation of BFD (Bidirectional Forwarding Detection) and VRRP. Focus on routing policy tools (Route-Policy, Filter-policy, IP-Prefix List) to manipulate traffic paths. Learn to architect "Self-Healing" networks that can switch paths in under 50ms using hardware-level fast-reroute (FRR) technologies.

MPLS & Segment Routing (18%)

The "Label-Switching" core. Master the deployment of MPLS (Multi-Protocol Label Switching) and LDP. In 2026, this domain places a massive focus on SR-MPLS and SRv6. Understand the transition from traditional Tunneling to "Source Routing," where the path is encoded in the packet header, drastically reducing the state maintained in the network core.

IPv6 Evolution & Transition (12%)

The "Modern" protocol layer. Master the IPv6 address architecture, ICMPv6, and Neighbor Discovery (ND). Focus on transition technologies like 6to4, ISATAP, and Dual-Stack. In 2026, the focus is on IPv6-Only core architectures and the use of IPv6 extension headers to support network programmability and telemetry.

Network Management & SDN (13%)

The "Automation" layer. Master the concepts of SDN (Software Defined Networking) and the role of the iMaster NCE controller. Focus on NETCONF, YANG, and SNMP protocols for network orchestration. Learn to manage network quality using Telemetry and NQA (Network Quality Analyzer) to provide real-time visibility into the user experience.

Huawei H12-821_V1.0 Exam Domains Q&A

Certified instructors verify every question for 100% accuracy, providing detailed, step-by-step explanations for each.

Question 1 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes. Which of the following values is the default DIS priority of an IS-IS interface?

A.
200
B.
64
C.
1
D.
100

Correct Answer & Rationale:

Answer: B

Explanation:

Comprehensive and Detailed in-depth Step-by-Step Explanation:

In an Intermediate System to Intermediate System (IS-IS) network, a Designated Intermediate System (DIS) is elected on broadcast networks to perform the following functions:

Represent the broadcast network as a pseudonode.

Generate and update the Link State Protocol Data Units (LSPs) for the pseudonode.

The DIS is elected based on the DIS priority value, which is configured on IS-IS interfaces. If two routers have the same priority, the router with the higher MAC address becomes the DIS.

The default DIS priority for IS-IS interfaces is 64 , which can be modified depending on the network requirements.

Option A (200): Incorrect. This is not the default value.

Option B (64): Correct. This is the default DIS priority value.

Option C (1): Incorrect. This is not the default value.

Option D (100): Incorrect. This is not the default value.

[References:, Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Basics"., RFC 1195 – Use of OSI IS-IS for Routing in TCP/IP and Dual Environments., , ]

Question 2 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Based on IGMP snooping, IGMP snooping proxy enables a switch to act as a substitute for an upstream Layer 3 device to send IGMP Query messages to downstream hosts, and also to act as a substitute for downstream hosts to send IGMP Report/Leave messages to an upstream device. As such, this function conserves bandwidth between the upstream device and the local device.

A.
TRUE
B.
FALSE

Correct Answer & Rationale:

Answer: A

Explanation:

 GMP Snooping Proxy

IGMP snooping proxy allows the switch to substitute for upstream Layer 3 devices and downstream hosts, reducing unnecessary bandwidth consumption by consolidating IGMP messages.

 HCIP-Datacom-Core Reference

The IGMP snooping proxy functionality is described in multicast optimization and IGMP configuration chapters

Question 3 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

NETCONF is a network configuration protocol that automates network configuration in a programmable manner, simplifying and accelerating network service deployment. Which of the following operations can be performed by using this protocol?

A.
Modifying configurations
B.
Deleting configurations
C.
Restoring configurations
D.
Backing up configurations

Correct Answer & Rationale:

Answer: A, B, C, D

Explanation:

Comprehensive and Detailed Step-by-Step Explanation:

1. What is NETCONF?

NETCONF (Network Configuration Protocol) is an XML-based protocol used for network device configuration and management.

It enables reading, modifying, deleting, and restoring configurations programmatically.

2. Supported Operations:

Option A: Modifying configurations

Correct.

NETCONF allows you to modify existing configurations on network devices.

Option B: Deleting configurations

Correct.

Configurations can be deleted using NETCONF operations.

Option C: Restoring configurations

Correct.

NETCONF can restore configurations by applying previously saved configuration data.

Option D: Backing up configurations

Correct.

NETCONF can retrieve and save the current configuration as a backup.

3. Summary:

NETCONF supports all listed operations: modifying, deleting, restoring, and backing up configurations.

[Reference:, Huawei HCIA-Datacom Study Guide, Chapter "NETCONF and Network Automation.", , ]

Question 4 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Which of the following parameters are not mandatory during the configuration of a BGP peer?

A.
password
B.
Peer IP address
C.
as-number
D.
description

Correct Answer & Rationale:

Answer: A, D

Explanation:

The mandatory parameters for BGP peer configuration are the peer IP address ( peer ip-address ) and AS number ( as-number ). A password is optional for MD5 authentication, and a description is an optional comment for reference. These are not required for establishing the peer relationship .

Question 5 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Which of the following protocols are multi-channel protocols?

A.
H.323
B.
FTP
C.
Telnet
D.
SMTP

Correct Answer & Rationale:

Answer: A, B

Explanation:

Multi-channel protocols such as H.323 and FTP use separate control and data channels. H.323 uses different channels for call signaling and media streaming, while FTP uses a control channel for commands and a data channel for file transfers. Telnet and SMTP are single-channel protocols .

Question 6 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Which of the following statements about stack split is false?

A.
After a stack splits, the MAC addresses of the two stacks change immediately.
B.
If the master and standby switches are still in the same stack after the stack splits, the slave switches separated from the original master and standby switches re-elect the master and standby switches due to protocol packet timeout.
C.
If the master and standby switches are in two stacks after the split, the stack where the original master switch resides updates the topology and selects a new standby switch. The original standby switch becomes the master switch in the new stack and a new standby switch is elected.
D.
After a stack splits, multiple stacks have the same IP address and MAC address. To prevent network faults, the stacks perform MAD detection. The stack that fails the MAD detection shuts down all physical ports except reserved ports.

Correct Answer & Rationale:

Answer: A

Explanation:

When a stack splits, the MAC addresses of the newly formed stacks do not change immediately. Instead, they retain their original MAC addresses until new ones are reassigned during topology updates. This delayed update prevents immediate conflicts and allows MAD (Multiple Active Detection) to handle any resulting issues .

Question 7 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Which of the following statements regarding the MED value in BGP are true?

A.
According to BGP route selection rules, the MED value has a lower priority than AS_Path, Preferred-Value, Local-Preference, and Origin.
B.
The default MED value of BGP routes is 0.
C.
By default, BGP can compare the MED values of routes from different ASs.
D.
By default, if there is no MED value in routes, the value 0 is used. If the bestroute med-none-as-maximum command is configured, the maximum MED value 4294967295 is used.

Correct Answer & Rationale:

Answer: A, D

Explanation:

The MED (Multi-Exit Discriminator) is an optional, non-transitive attribute used to influence the exit path. MED is considered after attributes such as Local-Preference, AS-Path, and Origin during route selection. By default, if a MED value is missing, it is treated as 0 unless the bestroute med-none-as-maximum command is configured to treat it as 4294967295 .

Question 8 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Four routers run ISIS and have established adjacencies. The area IDs and router levels are marked in the following figure. If route leaking is configured on R3, which of the following is the cost of the route from R4 to 10.0.2.2/32?

A.
80
B.
50
C.
40
D.
30

Correct Answer & Rationale:

Answer: A

Explanation:

In the given topology, the route from R4 to 10.0.2.2/32 traverses R3, which performs route leaking from Level-2 to Level-1. The cost is calculated as follows: R4 to R3 (40) + R3 to R2 (10) + R2 to the destination (30), resulting in a total cost of 80 .

Question 9 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

Which of the following statements regarding an IP prefix are true?

A.
An IP prefix filter is used to filter IP address prefixes and cannot match an IP prefix number and a prefix length at the same time.
B.
An IP prefix filter cannot be used to filter data packets.
C.
An IP prefix filter is used to filter IP address prefixes and can match an IP prefix number and a prefix length at the same time.
D.
An IP prefix filter can be used to filter data packets.

Correct Answer & Rationale:

Answer: C

Explanation:

An IP prefix filter is designed to match both the IP address and its prefix length, making it suitable for filtering routing information rather than data packets. Options A and D are incorrect because IP prefix filters do not work directly on data packets, and they can match both prefix numbers and lengths .

Question 10 Huawei H12-821_V1.0

QUESTION DESCRIPTION:

In IP multicast transmission , packets are transmitted from a source to a group of receivers . Which of the following statements are true about IP multicast technologies?

A.
Compared with broadcast, IP multicast prevents information flooding.
B.
Compared with broadcast, IP multicast effectively conserves network bandwidth.
C.
Compared with unicast, IP multicast improves information transmission security.
D.
Compared with unicast, IP multicast increases the load of information sources.

Correct Answer & Rationale:

Answer: A, B

Explanation:

Comprehensive and Detailed In-Depth Explanation:

IP Multicast vs. Broadcast:

A. TRUE → Unlike broadcast , which sends data to all hosts in a subnet, multicast only sends data to interested receivers , preventing flooding .

B. TRUE → Multicast optimizes bandwidth usage by sending a single copy of data , which is then replicated at network routers only when necessary .

IP Multicast vs. Unicast:

C. FALSE → Multicast does not improve security ; it may expose data to unintended receivers if not properly controlled .

D. FALSE → Multicast reduces the load on the source because a single data stream serves multiple receivers instead of sending individual unicast streams .

???? Reference: Huawei HCIA-Datacom Study Guide, IP Multicast Principles and Benefits.

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