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| Certification Vendor: | Huawei |
|---|---|
| Exam Name: | HCIE-Datacom V1.0 Written Exam |
| Exam Number: | H12-891_V1.0 |
| Exam Format: | Single choice questions, Multiple choice questions |
| Real Exam Qty: | 60-70 |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 300 (approx.) |
| Passing Score: | 600/1000 |
| Related Certifications: | HCIA-Datacom HCIP-Datacom HCIE-Datacom |
| Available Languages: | Chinese, English |
| Exam Duration: | 120 minutes |
| Recommended Training: | HCIE-Datacom Official Training Huawei Learning Platform |
| Exam Registration: | Huawei Certification Exam Registration Huawei Talent Certification Platform |
| Sample Questions: | Huawei H12-891_V1.0 Sample Questions |
| Exam Way: | Computer-based online or authorized test center exam (via Huawei certification system / Pearson VUE where applicable). |
| Pre Condition: | Recommended to hold HCIP-Datacom certification or equivalent knowledge before attempting HCIE-Datacom exam. |
| Official Syllabus URL: | https://e.huawei.com/en/talent/#/cert/overview |
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Huawei H12-891_V1.0 Exam is a rigorous certification exam that requires a significant amount of preparation and study. However, achieving this certification can be highly beneficial for individuals looking to advance their career in the ICT industry, as it demonstrates a high level of expertise in the field of data communication.
NEW QUESTION # 271
BGP Link State (BGP-LS) introduces a new NLRI into BGP. The NLRI carries link, node, topology prefix, and other information, and is also referred to as the link state NLRI.
Answer: A
Explanation:
Understanding BGP Link State (BGP-LS)
# What is BGP-LS?
* BGP-LS (BGP Link-State) is an extension of BGP that allows routers to exchange network topology information via Link-State NLRI.
* Helps SDN controllers and path computation elements (PCEs) make intelligent routing decisions.
# What Does BGP-LS Advertise?# Node Information - Router IDs, Loopbacks# Link Information - Bandwidth, Delay, Cost# Prefix Information - Network Subnets# Topology Information - Full network graph Why is the Answer TRUE?
# BGP-LS introduces a new NLRI format for advertising link-state information.# NLRI (Network Layer Reachability Information) is used to distribute topology data to SDN controllers.# It improves path optimization by enabling centralized traffic engineering decisions.
Real-World Application:
* SDN-Based Traffic Engineering: Used in Segment Routing (SR) networks for centralized path selection.
* MPLS TE (Traffic Engineering): Optimizes network paths dynamically based on real-time link-state data.
# Reference: Huawei HCIE-Datacom Guide - BGP Link-State (BGP-LS) Fundamentals
NEW QUESTION # 272
MPLS supports both static and dynamic LSP establishment. Which of the following protocols cannot dynamically establish LSPs in MPLS TE scenarios? (Select all that apply)
Answer: A,B,D
Explanation:
In MPLS Traffic Engineering (TE), Label Switched Paths (LSPs) can be established:
Statically: Manual configuration.
Dynamically: Typically via RSVP-TE.
Protocol roles:
RSVP-TE: Used to dynamically establish and signal TE LSPs → ✅
OSPF / IS-IS: Act as IGP protocols and provide TE-related link-state information (like bandwidth) but do not establish LSPs themselves → ❌ BGP: Used for route advertisement, not for LSP setup in MPLS TE → ❌ Correct answers: A, C, D
NEW QUESTION # 273
Which of the following statements about SR-MPLS Policy candidate paths are correct?
Answer: A,B,C,D
Explanation:
Comprehensive and Detailed
✔ SR-MPLS Policy candidate paths are used for flexible path selection and load balancing in Segment Routing (SR-MPLS) networks.
✔ Correct Statements:
✅ (A) Each candidate path can have multiple segment lists, each with its own weight for load balancing.
✅ (B) Load balancing is supported both between candidate paths and within segment lists.
✅ (C) An SR-MPLS Policy can contain multiple candidate paths, each with a preference value.
✅ (D) The candidate path with the highest preference is selected as the primary path.
📖 Reference: Huawei HCIE Datacom - SR-MPLS Policy Path Selection
NEW QUESTION # 274
Which of the following issues do DiffServ model-based QoS have?
Answer: A,B,C,D
Explanation:
DiffServ QoS model operates on per-hop behavior (PHB) and has these limitations:
A . ✅ Single-hop behavior; no end-to-end path awareness.
B . ✅ Cannot guarantee dedicated resources to individual users.
C . ✅ Does not address traffic bursts; congestion is still possible.
D . ✅ Queue limitations hinder fine-grained SLA assurance and deterministic delay.
Exact Extract - HCIE-Datacom QoS Section:
"DiffServ provides PHB without path-level control. It cannot guarantee SLA for individual users due to limited queuing mechanisms and lack of end-to-end visibility." Reference:
Huawei HCIE-Datacom Guide - QoS Architecture and Models
Huawei Campus QoS Deployment Best Practices
NEW QUESTION # 275
In an MPLS VPN network, two-layer MPLS labels are added into data packets before they are transmitted over the public network. Which of the following statements regarding data packet processing are correct?
Answer: A,B,C
Explanation:
In MPLS VPN, packets are forwarded using two labels:
* Outer label (Transport Label) - Used by the MPLS backbone for forwarding.
* Inner label (VPN Label) - Used by the egress PE to identify the correct VPN instance.
Explanation of Correct Options:
# A. The egress PE sends the data packet to the correct VPN based on the inner label.
* The inner label is assigned by the egress PE and determines the final destination VPN instance.
# B. The penultimate hop removes the outer label before forwarding the data packet to a peer egress PE.
* Penultimate Hop Popping (PHP) occurs when the second-to-last router (P router) removes the outer MPLS label before forwarding to the egress PE.
* This reduces the processing overhead on the egress PE.
# D. The penultimate-hop device receives a packet with an outer label.
* The outer label is used to forward the packet across the MPLS backbone.
* Before reaching the egress PE, the penultimate router still has the outer label and processes it.
Incorrect Option:
# C. The IP data packet received by the egress LSR is without labels.
* This is incorrect because the inner label (VPN label) is still present when the packet reaches the egress PE.
* Only the outer label is removed by PHP, not the inner VPN label.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei MPLS VPN Configuration Guide - Label Processing
* HCIE-Datacom MPLS Traffic Engineering and PHP Mechanism
* Huawei iMaster NCE-Campus MPLS VPN Implementation Guide
NEW QUESTION # 276
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