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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Advanced Routing and Switching Technologies	37%	- Network Quality and Optimization 1. Traffic engineering and MPLS technology 2. QoS mechanism and deployment - Advanced Switching Technologies 1. Multicast routing and deployment 2. Ethernet protection and reliability technologies 3. VXLAN and EVPN principles and application - Advanced Routing Protocols 1. IS-IS protocol principles and deployment 2. OSPF advanced features and optimization 3. BGP route control, policy and deployment
Topic 2: WAN Interconnection Network Planning and Deployment	8%	- WAN Interconnection Technologies 1. SD-WAN architecture and Huawei solution 2. Traditional WAN connection technologies - WAN Service Optimization 1. WAN security and isolation design 2. WAN link reliability and load balancing
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. eSight and iMaster NCE tools 2. API-based network operation and maintenance 3. Configuration automation and deployment
Topic 4: Bearer WAN Planning and Deployment	15%	- Bearer Network Architecture 1. CloudWAN solution and application scenarios 2. Typical bearer network structure and requirements - High-level Technology Deployment 1. SRv6 principles and deployment 2. Network slicing and service bearing
Topic 5: Campus Network Planning and Deployment	23%	- Campus Network Service Deployment 1. WLAN planning and deployment 2. User access management and security 3. Campus network management and operation - Campus Network Architecture Design 1. CloudCampus solution architecture and features 2. Typical campus network structure and design principles

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Huawei HCIE-Datacom V1.0 認定 H12-891_V1.0 試験問題 (Q89-Q94):

質問 # 89
As shown in the figure, ARP broadcast suppression is enabled on VTEP1 in BD 20 (VNI 200).
* VTEP1 learns ARP information about PC2 through BGP EVPN routes.
* When VTEP1 forwards the ARP request for PC1's MAC address to VTEP2,
* What is the destination MAC address of the inner data frame?

A. MAC B
B. MAC C
C. MAC D
D. MAC A

正解：B

解説：
Understanding VXLAN and ARP Suppression in BGP EVPN
VXLAN (Virtual Extensible LAN) is used to extend Layer 2 networks over Layer 3 infrastructure.
* VXLAN uses VTEPs (VXLAN Tunnel Endpoints) to encapsulate and forward Layer 2 traffic.
* BGP EVPN (Ethernet VPN) is used for MAC/IP address learning and distribution across VXLAN networks.
How ARP Request Forwarding Works in This Scenario?
1## ARP Broadcast Suppression Enabled (VXLAN Optimized Forwarding)
* Since ARP broadcast suppression is enabled on VTEP1, the ARP request is not flooded.
* Instead, VTEP1 checks its EVPN learned database to find PC2's MAC address (MAC C).
2## VTEP1 Encapsulates the ARP Request
* VTEP1 encapsulates the ARP request in a VXLAN packet and sends it to VTEP2.
* The original ARP frame inside the VXLAN tunnel still has:
* Source MAC: MAC A (PC1's MAC)
* Destination MAC: MAC C (PC2's MAC, learned via EVPN)
3## VXLAN Outer Headers
* The outer VXLAN header uses:
* Source IP: 1.1.1.1 (VTEP1)
* Destination IP: 2.2.2.2 (VTEP2)
* VNI (VXLAN Network Identifier): 200 (BD 20)
4## VTEP2 Receives and Forwards the ARP Request
* VTEP2 decapsulates the VXLAN packet and forwards the original ARP request to PC2 (MAC C).
* This ensures that only the intended receiver (PC2) gets the ARP request, preventing unnecessary broadcast flooding.
Why the Answer is MAC C?
# B. MAC C is Correct
* The destination MAC of the inner data frame is PC2's MAC (MAC C).
* This is because VTEP1 forwards the ARP request directly to VTEP2, which then forwards it to PC2.
Why Other Answers Are Incorrect?
# A. MAC B (Incorrect)
* MAC B is VTEP1's MAC address, which is used in the outer VXLAN header, not in the inner Ethernet frame.
# C. MAC A (Incorrect)
* MAC A is the source MAC of the ARP request (PC1), not the destination.
# D. MAC D (Incorrect)
* MAC D is not mentioned in the topology, so it is irrelevant.
# Reference: Huawei HCIE Datacom - VXLAN BGP EVPN and ARP Suppression

質問 # 90
After BGP introduces routes for other protocols, the next hop in the BGP routing table is consistent with the next hop of the introduced routing protocol

A. True
B. False

正解：B

質問 # 91
In cross-domain VPN-OptionB packet forwarding, two ASBRs exchange the same LSP tags once.

A. True
B. False

正解：B

質問 # 92
When MPLS/BGP IP VPN is deployed, which of the following statements is incorrect about BGP route exchange between PEs and CEs?

A. When PEs and CEs use BGP to exchange routing information, you do not need to import private network routes to BGP on PEs.
B. In a scenario where PEs and CEs use BGP to exchange routing information, if two VPN sites have the same private AS number, the AS number replacement function can be used to replace the AS number in a received private network route with any specified AS number. This prevents routes from being discarded because of repeated AS numbers.
C. In a Hub & Spoke scenario, when Hub-CE and Hub-PE run an IGP for communication, EBGP cannot be configured on Spoke-PE or Spoke-CE.
D. In a CE multi-homing scenario, the BGP AS number replacement function may cause routing loops.
BGP SoO can be used to prevent routing loops at a VPN site.

正解：C

解説：
Option B is incorrect because it falsely states that EBGP cannot be configured on Spoke-PE or Spoke-CE if the Hub-CE and Hub-PE run IGP. In reality, EBGP can still be used between Spoke sites and PE devices, regardless of the protocol between the Hub PE and CE. EBGP is often used for PE-CE communication, including in Hub-and-Spoke architectures.
Exact Extract - Huawei HCIE-Datacom VPN Section:
"In Hub & Spoke deployments, EBGP can be deployed between Spoke-CE and Spoke-PE. The choice of routing protocol between Hub-CE and Hub-PE does not limit this." Reference:
Huawei HCIE-Datacom Guide - MPLS L3 VPN Deployment
Huawei Datacom Study Guide - PE-CE Protocol Selection in VPNs

質問 # 93
Flavors are additional behaviors defined to enhance the End series instructions in SRv6. Which of the following End instructions can the PSP flavor be attached to?

A. End.BM
B. End.X
C. End.T
D. End

正解：B、C、D

解説：
Comprehensive and Detailed
✔ SRv6 (Segment Routing over IPv6) Flavors provide additional processing behaviors for SRv6 End instructions.
✔ PSP (Penultimate Segment Popping) Flavor:
PSP enables the penultimate node to remove the SRH (Segment Routing Header) before forwarding the packet to the last segment.
This reduces the processing overhead on the final segment node.
✔ Correct End Instructions for PSP:
✅ (A) End.X → Cross-connect behavior between segments.
✅ (C) End.T → Transport encapsulation in SRv6.
✅ (D) End → Basic SRv6 endpoint behavior.
❌ (B) End.BM is incorrect → This is used for Binding Segment (BSID) behavior and does not support PSP.
📖 Reference: Huawei HCIE Datacom - SRv6 Flavors and End Instructions

質問 # 94
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