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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: 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. Network slicing and service bearing 2. SRv6 principles and deployment
Topic 2: 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
Topic 3: Network Automation Technologies and Practice	17%	- Automation Foundation 1. Network programming basis and protocols 2. YANG model and data modeling - Huawei Automation Solutions 1. API-based network operation and maintenance 2. Configuration automation and deployment 3. eSight and iMaster NCE tools
Topic 4: Advanced Routing and Switching Technologies	37%	- Advanced Routing Protocols 1. BGP route control, policy and deployment 2. OSPF advanced features and optimization 3. IS-IS protocol principles and deployment - Network Quality and Optimization 1. QoS mechanism and deployment 2. Traffic engineering and MPLS technology - Advanced Switching Technologies 1. Multicast routing and deployment 2. Ethernet protection and reliability technologies 3. VXLAN and EVPN principles and application
Topic 5: 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. User access management and security 2. Campus network management and operation 3. WLAN planning and deployment

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Huawei HCIE-Datacom V1.0 Sample Questions (Q146-Q151):

NEW QUESTION # 146
Which of the following is the drop probability of packets exceeding the upper threshold in WRED?

A. 0.8
B. 0.5
C. 0.2
D. 0

Answer: D

Explanation:
* WRED (Weighted Random Early Detection) helps prevent congestion by randomly discarding packets before buffers are full.
* Drop Probability Behavior:
* Below lower threshold = 0% drop (packets pass normally).
* Between lower & upper threshold = Progressively increasing drop probability.
* Above upper threshold = 100% drop (probability = 1).
# Reference: Huawei HCIE-Datacom Guide - WRED Mechanism

NEW QUESTION # 147
In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, which of the following statements about the functions of BGP EVPN Type 3 routes is incorrect?

A. Type 3 routes carry L3VNIs.
B. If the VTEP IP address carried in the received Type 3 route is reachable at Layer 3, a VXLAN tunnel to the peer end is established.
C. Type 3 routes carry L2VNIs and VTEP IP addresses.
D. If the VTEP IP address of a Type 3 route is reachable at Layer 3 and the peer VNI is the same as the local VNI, an ingress replication list is created for forwarding BUM packets.

Answer: A

Explanation:
Comprehensive and Detailed Explanation:
BGP EVPN Type 3 routes are used for VXLAN ingress replication and BUM (Broadcast, Unknown unicast, and Multicast) traffic forwarding.
# Type 3 routes contain L2VNIs, not L3VNIs # (C is incorrect)
Key Functions of Type 3 Routes:
* Distribute VTEP IP addresses to establish VXLAN tunnels.
* Include L2VNIs for mapping Layer 2 broadcast domains.
* Used in Ingress Replication for BUM traffic.
Since Type 3 routes do not carry L3VNIs, the correct answer is C.
# Reference: Huawei HCIE Datacom - BGP EVPN Type 3 Routes

NEW QUESTION # 148
In Huawei SD-WAN Solution, which of the following tunneling technologies is used to establish data channels?

A. MPLS
B. WLAN
C. GRE over IPsec
D. IPsec

Answer: C,D

Explanation:
Understanding Huawei SD-WAN Tunneling Technologies
Huawei SD-WAN uses secure tunneling to connect branches, data centers, and cloud services.
🔹 Tunneling Technologies in SD-WAN:
✅ IPsec (Answer B) → Provides secure encrypted tunnels over public or private networks.
✅ GRE over IPsec (Answer D) → Encapsulates traffic inside GRE, then encrypts with IPsec, enabling support for multicast and non-IP traffic.
❌ A. WLAN (Incorrect Choice) → WLAN is a wireless technology, not a tunneling protocol.
❌ C. MPLS (Incorrect Choice) → MPLS is a core network transport technology but is not used to establish SD-WAN data channels directly.
Why are Answers B and D Correct?
✅ Huawei SD-WAN primarily uses IPsec for data encryption.
✅ GRE over IPsec is used when supporting multicast or dynamic routing protocols over tunnels.
✅ Reference: Huawei HCIE-Datacom Guide - SD-WAN Tunneling Mechanisms

NEW QUESTION # 149
As shown in the figure, the use of redundant links between the branch and the headquarters to establish IPsecVPN, while turning on URLPF on the Router_B for traffic from branch l, which of the following options is correct?

A. When using IPsec active-standby link redundant backups to enable the URPF function under the physical interface , it is recommended to use URPF loose mode.
B. When using lPsec active-standby link redundancy backup, the URPF function is enabled under the physical interface, and URPF strict mode can be used.
C. When using IPsec multilink redundant backups, urPF can be enabled under the tunnel interface, and URPF strict mode can be used
D. When using IPsec multilink redundant backup, the URPF function can be used under the physical interface, and URPF strict mode can be used

Answer: A,C

NEW QUESTION # 150
In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, run the command on the VTEP to view BGP EVPN routes. The route entries shown in the following figure are displayed. Which of the following statements about these routing entries are correct?
Network (EthTagId/IP Prefix/IP PrefixLen)
NextHop
*>i 0:172.16.2.0:24 1.1.1.2
*>i 0:172.16.13.0:24 1.1.1.2
*>i 0:192.168.122.0:30 1.1.1.2

A. These routes are Type 2 routes and carry host IP addresses.
B. These routes carry the L2VNI.
C. These routes carry the L3VNI.
D. These routes are Type 5 routes and carry network segment or mask information.

Answer: C,D

Explanation:
Understanding BGP EVPN Route Types for VXLAN
🔹 BGP EVPN (Ethernet VPN) is used for VXLAN control-plane learning.
✅ EVPN Type 2 Route (MAC/IP Advertisement)
Carries: MAC + Host IP
Used for: L2 forwarding, Host Mobility
✅ EVPN Type 5 Route (IP Prefix Advertisement)
Carries: Network segment (Subnet) + Prefix
Used for: VXLAN L3 routing
🔹 What Do the Given Route Entries Show?
0:172.16.2.0/24
0:172.16.13.0/24
0:192.168.122.0/30
👉 These are IPv4 Subnets, NOT individual MACs.
👉 Since they carry IP Prefixes, they belong to EVPN Type 5.
Analysis of the Answer Choices:
✅ A. These routes are Type 5 routes and carry network segment or mask information.
Correct: The displayed routes carry network prefixes, which belong to EVPN Type 5.
❌ B. These routes are Type 2 routes and carry host IP addresses.
Incorrect: Type 2 routes carry MAC + Host IP, NOT full subnets.
❌ C. These routes carry the L2VNI.
Incorrect: L2VNI is for Layer 2 VXLAN bridging, but these are IP Prefix Routes (L3 routing).
✅ D. These routes carry the L3VNI.
Correct: Type 5 routes are used for VXLAN L3 routing, which means they belong to L3VNI.
Real-World Application:
VXLAN L3 Gateways: Type 5 routes enable distributed routing between VXLAN segments.
Data Center Networks: Used to interconnect virtual machines (VMs) across different subnets.
✅ Reference: Huawei HCIE-Datacom Guide - BGP EVPN & VXLAN L3 Routing

NEW QUESTION # 151
......

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