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  3. H12-821_V1.0

Huawei H12-821_V1.0 Exam (page: 2)
Huawei HCIP-Datacom-Core Technology V1.0
Updated on: 12-Feb-2026

Viewing Page 2 of 45
H12-821_V1.0 PDF 399 Questions

OSPF has five types of packets, which have the same header format. If the Auth Type field in the packet header is 1, which of the following authentication modes is used?

  1. Non-authentication
  2. MD5 authentication
  3. Plaintext authentication
  4. Hash authentication

Answer(s): C

Explanation:

OSPF Authentication Overview

The Auth Type field in the OSPF packet header determines the authentication mode. If the Auth Type is 1, plaintext authentication is used.

Plaintext authentication involves transmitting the password in an easily readable format, which is less secure compared to MD5.

HCIP-Datacom-Core Reference

Authentication mechanisms, including plaintext authentication, are detailed in the OSPF security configuration chapter, confirming that Auth Type = 1 corresponds to plaintext.



On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.

  1. TRUE
  2. FALSE

Answer(s): B

Explanation:

OSPF LSA Flooding Mechanism

If a router receives an LSA identical to one already in its LSDB, it does not flood the LSA again unless the LSA has changed (i.e., the sequence number or content has been updated).

OSPF ensures efficient use of bandwidth by avoiding redundant flooding of unchanged LSAs.

HCIP-Datacom-Core Reference

The OSPF LSDB synchronization process explains that unchanged LSAs are not reflooded, ensuring stability and resource optimization.



An enterprise uses OSPF to implement network communication. To ensure data validity and security, all authentication modes supported by OSPF are enabled on routers. In this case, interface authentication is preferentially used by the routers.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

OSPF Authentication Overview
OSPF supports three authentication modes:

Null Authentication: No authentication (default).

Plaintext Authentication: Uses clear-text passwords.

MD5 Authentication: Secure cryptographic authentication.

Interface-Level Priority
When both interface-level and area-level authentication are configured, OSPF prioritizes interface- level authentication. This ensures that interface-specific security overrides area-wide configurations for greater granularity and security.

HCIP-Datacom-Core Reference

OSPF authentication hierarchy and configurations are detailed in the OSPF security configuration chapter.



The following figure shows the OSPF network of an enterprise and the OSPF configurations of R1.
Which of the following statements is false about the network?

  1. R2 can access the server.
  2. GE 0/0/1 of R1 cannot send OSPF packets.
  3. The network segment to which GE 0/0/1 of R1 belongs cannot be advertised.
  4. GE 0/0/1 of R1 cannot accept OSPF packets.

Answer(s): C

Explanation:

Silent Interface Explanation

The silent-interface command is used to prevent OSPF from sending or receiving OSPF packets on the specified interface (GE 0/0/1). This disables OSPF adjacency establishment and stops route advertisement for that interface.

Network Observations

Statement A: R2 can access the server.
This is correct, as the silent interface does not impact data traffic, only OSPF-related communication.

Statement B: GE 0/0/1 of R1 cannot send OSPF packets.
Correct due to the silent-interface configuration.

Statement C: The network segment to which GE 0/0/1 of R1 belongs cannot be advertised.

This is correct, as the silent interface prevents route advertisement.

Statement D: GE 0/0/1 of R1 cannot accept OSPF packets. Correct, as the silent interface configuration blocks packet reception.

HCIP-Datacom-Core Reference

OSPF interface command behavior is outlined in the configuration and lab examples sections.



On an OSPF network, if two routers with the same router ID run in different areas and one of the routers is an ASBR, LSA flapping occurs.

  1. TRUE
  2. FALSE

Answer(s): A

Explanation:

Understanding Router ID and Its Role in OSPF:
In OSPF, the Router ID uniquely identifies a router within the OSPF domain. If two routers are configured with the same Router ID, it can lead to issues such as LSA conflicts and flapping. This is because the Router ID is used as a key in OSPF operations, including LSA generation and database synchronization.


Reference:

HCIP-Datacom-Core Technology Training Material (OSPF Basics - Router ID and LSA Handling).

Scenario Details:

Different Areas: Even if the two routers belong to different areas, the Router ID remains globally significant in the OSPF domain. This means that any duplication of Router IDs will confuse OSPF mechanisms.

ASBR (Autonomous System Boundary Router): When one of the routers is an ASBR, it generates Type 4 and Type 5 LSAs to describe external routes. These LSAs use the Router ID as an identifier. If another router in the network has the same Router ID, conflicts occur during LSDB synchronization.


HCIP-Datacom Advanced Routing & Switching Technology (LSA Types and ASBR Operations).

Impact of Router ID Duplication:

LSA Flapping: The OSPF process receives conflicting LSAs from routers with the same Router ID. This results in continuous updates and withdrawals of these LSAs, causing flapping.

Routing Instability: LSA flapping leads to frequent recalculations of the OSPF shortest path tree (SPT), affecting overall network stability.


HCIE-Datacom V1.0 Training Material (OSPF Troubleshooting and Best Practices).

Conclusion:

The statement is TRUE. LSA flapping occurs when two routers in an OSPF network have the same Router ID, even if they are in different areas and one is an ASBR. This is due to the global significance of Router IDs in OSPF and the role they play in LSA generation and propagation.



Viewing Page 2 of 45



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