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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Advanced Routing and Switching Technologies	37%	- Advanced Switching Technologies 1. VXLAN and EVPN principles and application 2. Multicast routing and deployment 3. Ethernet protection and reliability technologies - Network Quality and Optimization 1. QoS mechanism and deployment 2. Traffic engineering and MPLS technology - Advanced Routing Protocols 1. BGP route control, policy and deployment 2. IS-IS protocol principles and deployment 3. OSPF advanced features and optimization
Bearer WAN Planning and Deployment	15%	- Bearer Network Architecture 1. Typical bearer network structure and requirements 2. CloudWAN solution and application scenarios - High-level Technology Deployment 1. SRv6 principles and deployment 2. Network slicing and service bearing
Campus Network Planning and Deployment	23%	- Campus Network Architecture Design 1. Typical campus network structure and design principles 2. CloudCampus solution architecture and features - Campus Network Service Deployment 1. Campus network management and operation 2. User access management and security 3. WLAN planning and deployment
WAN Interconnection Network Planning and Deployment	8%	- WAN Service Optimization 1. WAN security and isolation design 2. WAN link reliability and load balancing - WAN Interconnection Technologies 1. Traditional WAN connection technologies 2. SD-WAN architecture and Huawei solution
Network Automation Technologies and Practice	17%	- Automation Foundation 1. YANG model and data modeling 2. Network programming basis and protocols - Huawei Automation Solutions 1. API-based network operation and maintenance 2. Configuration automation and deployment 3. eSight and iMaster NCE tools

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Huawei HCIE-Datacom V1.0 Sample Questions (Q171-Q176):

NEW QUESTION # 171
BGP4+ is running between two routers, and the neighbor relationship is normal, but the BGP routing table of the router on this side does not have a neighbor route entry.

A. BGP route entry is unreachable
B. Peer ignore is configured on the peer
C. The route entry in the peer BGP route table is non-optimal.
D. The next hop address of the
E. The peer is configured with active-route-advertise

Answer: B,C,D

NEW QUESTION # 172
After a wireless user passes Portal authentication, which of the following parameterscannotbe used for authorizing the user?

A. free-rule
B. UCL
C. IP address
D. ACL

Answer: C

Explanation:
Comprehensive and Detailed In-Depth Explanation:
AfterPortal authenticationon a wireless network, the following parameters can be used for authorization:
free-rule (A):Allows traffic even before authentication.
UCL (B):User Control List, specifying user permissions.
ACL (D):Access Control List, defining permitted or denied traffic.
TheIP address (C), however, isnot used as an authorization parameterdirectly. Instead, IP addresses are typically assigned after successful authentication, and the control policies are applied based on user profiles or access lists.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei WLAN Authentication Configuration Guide

NEW QUESTION # 173
A router Router LSA is shown in the figure, and the error in the following statement is ?

A. This router is a DR
B. This router supports external routing ingestion
C. The Router ID of this router is 100121
D. This router has established an adjacency relationship

Answer: A

NEW QUESTION # 174
Which of the following fields is added to BGP4+ Update packets to advertise IPv6 routes?

A. A new path attribute: MP_UNREACH_NLRI
B. A new path attribute: IPv6_REACH_NLRI
C. A new NLRI type: IPv6_NLRI, which carries the IPv6 NLRI prefix length and IPv6 NLRI prefix.
D. A new path attribute: MP_REACH_NLRI

Answer: D

Explanation:
Comprehensive and Detailed In-Depth
BGP4+ (BGP for IPv6) uses the MP_REACH_NLRI (Multiprotocol Reachable Network Layer Reachability Information) attribute to advertise IPv6 routes. This attribute is part of BGP's multiprotocol extensions (RFC 2858), allowing BGP to support multiple address families, including IPv6.
MP_REACH_NLRI: Advertises reachable IPv6 prefixes along with next-hop information.
MP_UNREACH_NLRI: Used to withdraw previously advertised IPv6 routes.
Since IPv6 addresses are significantly different from IPv4 addresses in structure and length (128 bits), the traditional BGP update message format (which supports only IPv4) is insufficient. The MP_REACH_NLRI attribute solves this by carrying IPv6-specific information.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei BGP Configuration and Implementation Guide
RFC 2858: Multiprotocol Extensions for BGP-4

NEW QUESTION # 175
An LSR (Label Switching Router) supports various label retention modes. Which of the following statements regarding the liberal mode are correct?

A. The liberal mode requires more memory and label space.
B. This label retention mode saves memory and label space.
C. An LSR reserves all labels distributed by its neighbor.
D. An LSR retains labels from a neighboring LSR only when the neighbor is its next hop.

Answer: A,C

Explanation:
Understanding MPLS Label Retention Modes
In MPLS (Multiprotocol Label Switching), a Label Switching Router (LSR) can operate in one of two label retention modes:
1## Liberal Label Retention Mode (LLRM)
* Stores all labels received from neighbors, even if they are not immediately used.
* Advantage: Fast convergence during link failures.
* Disadvantage: Consumes more memory & label space.
2## Conservative Label Retention Mode (CLRM)
* Only keeps labels for the best next-hop path.
* Advantage: Saves memory & label space.
* Disadvantage: Slower convergence when topology changes.
Why are C and D Correct?
# C. An LSR reserves all labels distributed by its neighbor.
* Correct: In Liberal Mode, the router accepts and stores all labels received, even for non-best paths.
# D. The liberal mode requires more memory and label space.
* Correct: Since the router keeps all labels, it requires higher memory & storage.
Why are A and B Incorrect?
# A. An LSR retains labels from a neighboring LSR only when the neighbor is its next hop.
* Incorrect: This describes Conservative Mode, not Liberal Mode.
# B. This label retention mode saves memory and label space.
* Incorrect: Liberal Mode consumes more memory, not less.
Real-World Application
* Liberal Mode is used in large-scale MPLS networks where fast failover is critical.
* Conservative Mode is preferred in memory-constrained environments.
# Reference: Huawei HCIE-Datacom Study Guide - MPLS Label Retention Modes

NEW QUESTION # 176
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