H12-821: HCIP-Datacom-Core TechnologyDemo

By Huawei · Browse Mode
About the Exam

This is the core technical exam for Huawei's HCIP-Datacom certification. It covers general datacom knowledge including routing basics, OSPF, IS-IS, BGP, Ethernet switching, multicast, IPv6, security, reliability, network management, WLAN, and network solutions. It is intended for candidates pursuing HCIP-Datacom and senior datacom engineer roles, and passing demonstrates core knowledge for enterprise network scenarios.

Exam Topics

  • Enterprise Application Architectures and Cloud Technologies5%
  • Cloud-based Architecture Design of Conventional Applications50%
  • Cloud Native Application Architecture Design30%
  • Huawei Cloud O&M Solution10%
  • Huawei Cloud Innovations and Solutions5%

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  1. Browse — Read each question, select your answer, and reveal the explanation.
  2. Exam Mode — Simulate real exam conditions with a timed session and score report.
  3. Learn Mode — Spaced repetition schedules questions you struggle with for long-term retention.

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Last updated July 14, 2026 at 2:08 PM

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QuestionQ1

Huawei Cloud O&M Solution

In an OSPF network, when a router receives an update for an LSA already present in its local LSDB, it updates the LSDB and floods the LSA.

  • A TRUE
  • B FALSE
Explanation

OSPF compares a received LSA with the corresponding LSDB entry. A received LSA is installed and flooded only when it is more recent than the database copy, subject to flooding-timing rules. An identical or older LSA is not simply installed and flooded.

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QuestionQ2

Enterprise Application Architectures and Cloud Technologies

Attackers frequently gain system-administrator login privileges through a variety of attacks. Which of the following actions can improve the security of administrator accounts?

Choose two
  • A Encrypt passwords before transferring them. Whenever possible, transfer passwords by email.
  • B Periodically check whether unnecessary administrator accounts exist in the system. If such accounts exist, delete them to reduce the attack surface.
  • C Assign exclusive accounts for administrators with different maintenance roles to avoid account sharing.
  • D To ensure security and make the password easier to remember, you can set the password to be valid for a long time.
Explanation

Privileged access should follow least privilege and individual accountability. Regularly removing unneeded administrator accounts reduces the attack surface, while separate accounts for administrators in distinct maintenance roles prevent account sharing and make permissions and activity traceable to an individual.

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QuestionQ3

Enterprise Application Architectures and Cloud Technologies

In OSPF, LSA flapping occurs when two routers with the same router ID operate in different areas and one router is an ASBR.

  • A TRUE
  • B FALSE
Explanation

An OSPF router ID must be unique throughout the OSPF autonomous system. An ASBR originates AS-external LSAs with AS-wide flooding scope, so duplicating its router ID on another router can create conflicting LSA originator information and result in LSA flapping.

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QuestionQ4

Enterprise Application Architectures and Cloud Technologies

Which statement below is false according to the IGMP information for an interface on RTA?

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  • A The IP address of the interface is 192.168.1.1.
  • B The interval for sending group-specific Query messages is 60s.
  • C The maximum time for response to Query messages is 10s.
  • D The IGMP version is IGMPv2.
Explanation

The 60-second query interval is the interval for IGMP General Query messages. IGMP Group-Specific Query messages use the last-member query interval instead. The interface information also directly shows address 192.168.1.1, IGMPv2, and a 10-second maximum Query-response time.

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QuestionQ5

Huawei Cloud O&M Solution

To lessen the effort required to configure VPN instances, an administrator can use a script to batch-import interface IP addresses and features to the device, and then manually bind the interfaces to VPN instances.

  • A TRUE
  • B FALSE
Explanation

Binding an interface to a VPN instance using ip binding vpn-instance deletes the interface’s Layer 3 configuration, including IP address and routing-protocol configuration. The VPN instance must be bound first, after which the interface IP configuration can be applied or restored.

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