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Huawei H12-891_V1.0 (HCIE-Datacom V1.0) Certification Exam is a highly sought-after certification for IT professionals who want to specialize in data communication technologies. HCIE-Datacom V1.0 certification exam validates the skills and knowledge required to design, plan, and operate complex data communication networks using Huawei's advanced technologies. Candidates who Pass H12-891_V1.0 Exam will gain recognition as experts in the field of data communication and will have a competitive edge in the job market.

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Huawei HCIE-Datacom V1.0 Sample Questions (Q228-Q233):

NEW QUESTION # 228
In the following figure, R1, R2, R3, and R4 all belong to OSPF area 0. The link costs are marked in the figure.
The Loopback0 addresses of R1, R2, R3, and R4 are advertised to OSPF. R1, R2, and R3, which are R4 clients, use Loopback0 to establish an iBGP peer relationship with R4. The directly connected network segment 172.20.1.4/32 of R4 is advertised to BGP. Which of the following statements are correct about the direction of traffic from R1 to 172.20.1.4/32?

Answer: A,D

Explanation:
Let's analyze the scenario and each statement carefully based on OSPF path selection and BGP behavior in Huawei routers.
# Option A: The preferred path is R1-R3-R4.
According to the OSPF cost values:
R1-R3-R4: Cost = 1 + 1 = 2
R1-R2-R4: Cost = 2 + 2 = 4
OSPF chooses the lowest-cost path to reach a destination. Therefore, R1 will prefer the R1-R3-R4 path to reach 172.20.1.4/32.
Huawei Datacom Reference:
" OSPF selects routes based on the shortest path calculated using link costs. The router always selects the path with the lowest cost. " (Source: HCIE-Datacom Study Guide v3.0 - OSPF Path Selection, Chapter 5)
# Option B: If the stub router on-startup command is run on R3, packet loss occurs during the power-off process of R3 but no packet loss occurs during the startup process of R3.
When R3 is powered off, OSPF needs to reconverge, which causes temporary packet loss.
When R3 starts up, it will advertise itself as a stub router using the stub-router on-startup command. This tells OSPF not to use R3 as a transit path during the startup period, thus preventing traffic blackholing.
Huawei Datacom Reference:
" stub-router on-startup command prevents a newly started router from being used as a transit node by OSPF, allowing routing to remain stable during convergence. " (Source: HCIE-Datacom Study Guide v3.0 - OSPF Stub Router Functionality, Chapter 6.2)
# Option C: The preferred path is R1-R2-R4.
This is incorrect because the OSPF path cost via R2 is higher (4) than the cost via R3 (2).
# Option D: Packet loss occurs during both the power-off and startup processes of R3.
Incorrect. As explained above, when the stub-router on-startup command is used, packet loss is avoided during startup, but still occurs during power-off since the alternate path requires convergence.


NEW QUESTION # 229
An LSR supports various label retention modes. Which of the following statements regarding the liberal mode are correct?

Answer: A,D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
In MPLS (Multi-Protocol Label Switching), thelabel retention modedetermines how an LSR (Label Switching Router) handles labels received from its neighbors:
Liberal Mode:
An LSRretains all labels distributed by its neighbors, not just the labels from the next-hop LSR.
This approachensures faster convergencebecause the LSR does not need to request new labels if the next hop changes.
Itdoes not save memory or label space, as it stores more labels than strictly necessary.
Conservative Mode:
An LSRonly retains labels from its next-hop neighbors, saving memory and label space.
StatementsCandDare correct because they accurately describe liberal mode.
StatementsAandBare incorrect because they describe conservative mode.


NEW QUESTION # 230
An SR-MPLS Policy needs to divert service traffic to a tunnel for forwarding. If traffic from various services is destined for the same address, which of the following traffic diversion modes is recommended to ensure the quality of each service?

Answer: A

Explanation:
Traffic Diversion in SR-MPLS Policy
SR-MPLS Policiesuse traffic steering mechanismsto direct specific flows toSegment Routing paths (SR Policies). When multiple services share thesame destination address,color-based traffic diversionensuresdifferentiated service treatment.
#B. Color-based traffic diversion (Correct Answer)
Traffic is classified based on "color" (a BGP-SR policy attribute) and mapped to different SR-MPLS tunnels.
Different colors represent different paths(e.g., high-priority services can use an optimized low-latency path).
This method ensures service qualityby directing traffic according topolicy-based routing decisions.


NEW QUESTION # 231
When you deploy LLQ, you need to configure bandwidth parameters, what is the significance of bandwidth parameters?( Single choice questions).

Answer: C


NEW QUESTION # 232
What is the exact description of the SSM features?

Answer: C


NEW QUESTION # 233
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