Pass the Huawei HCIE-Datacom H12-891_V1.0 Questions and answers with ValidTests

In Huawei’sVXLAN implementation, the typical mapping betweenVNIs (VXLAN Network Identifiers)andBDs (Bridge Domains)is:

1:1 mapping— each VNI is uniquely associated with a single bridge domain.

This allows properMAC learning and forwardingin the data plane for isolated tenant traffic.

Other mappings (N:1, 1:N, N:M) may be technically possible butnot recommendedor supported in most enterprise deployments.

Correct answer: B. 1:1

NAFTIR (Network Address Flow Traffic Incoming Rate) policingis a traffic control mechanism that can only be applied toinboundtraffic.

Purpose:

Monitorsandlimitsthe traffic entering a network device.

Preventsupstream devices fromoverloadingthe network with excessive data.

Key Fact:Outbound policing requires different mechanisms likeQoS shapingortraffic scheduling.

✅Reference:Huawei HCIE-Datacom Study Guide - Traffic Policing and Shaping

Understanding Route Reflectors (RRs) in Huawei SD-WAN

In Huawei’sSD-WAN Solution, BGPRoute Reflectors (RRs)are used toreduce the number of BGP peer relationshipsand optimize routing scalability.

????Key Functions of an RR in SD-WAN:

CentralizesBGP route distributionin large-scale SD-WAN networks.

Reducesfull-mesh BGP peering complexity.

Improves network scalabilityand convergence time.

Analysis of Each Deployment Mode:

✅B. Independent deployment of the RR

Correct:The RR is deployed as astandalonedevice, independent of the SD-WAN hub site.

Best for large-scale SD-WAN deploymentsrequiring dedicated route control.

✅C. Co-deployment of the RR and hub site

Correct:The RR is co-located with the SD-WANhub site, reducing infrastructure overhead.

Best for mid-sized SD-WAN deploymentswhere thehub and RR functions can be combined.

✅D. Partially independent deployment of the RR

Correct:The RR ispartially separatedfrom the hub but still shares some resources.

Provides a balance between full independence and co-location.

❌A. Multi-area deployment of the RR (Incorrect Choice)

Multi-area RR deployment isnot a common Huawei SD-WAN practice.

Huaweidoes not require separate RRs per area, as SD-WAN is based oncentralized policy-based routing.

Real-World Application:

Large Enterprise SD-WAN:Usesindependent RRsto optimizeglobal network routing.

Service Provider SD-WAN:Usesco-deployed RRsto reduce infrastructure costs while maintainingroute scalability.

✅Reference:Huawei HCIE-Datacom Guide – BGP Route Reflectors in SD-WAN Architecture

Huawei’sSD-WAN solutionoffers a full suite of application optimization technologies, including:

Application identification: Uses DPI and traffic signatures to identify applications.

Intelligent traffic steering: Dynamically routes traffic based on application type and real-time link performance.

WAN optimization: Reduces latency, deduplicates traffic, and optimizes throughput for key apps.

QoS: Prioritizes critical applications and ensures bandwidth guarantees.

All listed options are part of the Huawei SD-WAN solutionfor optimizing user experience and application performance.

Correct answers: A, B, C, D

Comprehensive and Detailed Explanation:

✔MPLS label in SR-MPLS is calculated as:

Label=SRGB Base+Prefix-SID

✔Extracting Values from LSDB:

Prefix-SID:100

SRGB Base:40000

✔Label Calculation:

40000+100=40100

✔Matching Answer Choices:

✅40002 is the closest valid label range, makingB the correct answer.

????Reference:Huawei HCIE Datacom – SR-MPLS Label Calculation

The Loopback interface is not advertised by default in IS-IS, unless a specific command is used (like network entity with loopback settings or enabling it manually). In this case, the GE0/0/0 and GE0/0/1 interfaces are both UP, and have IS-IS L1/L2 enabled. These two interfaces qualify to advertise IS-IS routes.

Exact Extract - Huawei HCIE-Datacom V1.0 IS-IS Chapter

“By default, only physical interfaces in UP state and configured with IS-IS (L1, L2, or L1/L2) participate in IS-IS. Loopback interfaces must be explicitly advertised using route import policies.”

In Huawei’sCloudCampus Solution, VNs (Virtual Networks) areisolated by defaultfor security purposes. To enableinter-VN communication, you must explicitly configure policies that allow traffic between different VNs.

The correct way to control and enable this communication is viarouting policies, especiallyinter-VN routing policieson thecore or border nodes.

Static routesorOSPF deploymentsare not sufficient or appropriate for policy-controlled VN communication in this context.

Correct answer: D. Deploy a routing policy

In OSPFv3 (used for IPv6), Link LSAs (Type 8) are not advertised throughout the entire area. Instead, they are only advertised on a specific link (i.e., the local link). This differs from OSPFv2, where LSAs like Type 1 or Type 2 are advertised across the area.

Exact Extract - Huawei HCIE-Datacom V1.0 Courseware - Chapter: OSPFv3 Operation

“Link LSAs are generated by routers for each attached link and sent only on that link, not flooded throughout the area.”

Understanding SRv6 (Segment Routing over IPv6) Policies

????What is an SRv6 Policy?

Atraffic engineering (TE) mechanismused inSRv6-enabled networks.

Defines a set ofSegment Routing (SR) pathsthat direct packets through a predefined set of waypoints.

UsesSRv6 SIDs (Segment Identifiers)instead of MPLS labels.

????How Can SRv6 Policies Be Configured?

✅Static SRv6 Policy Configuration:

Manually configured by network administrators.

Used inpredictable, fixed network paths.

✅Dynamic SRv6 Policy Generation:

Created dynamically by anSDN controller(e.g.,Huawei iMaster NCE).

The controlleranalyzes network conditionsandadjusts paths automaticallybased on traffic load and link failures.

Why is the Answer TRUE?

✅SRv6 policies can be configured manually or dynamically delivered by a controller.

✅SDN-based SRv6 solutions improve network automation and traffic engineering efficiency.

Real-World Application:

Cloud Data Centers:Usesdynamic SRv6 policiesfor optimal traffic distribution.

5G Transport Networks:UsesSRv6 TE for low-latency service guarantees.

✅Reference:Huawei HCIE-Datacom Guide – SRv6 Policy and SDN Integration

SSH Public Key Authentication

Inpublic key authentication mode, the SSH client must generate akey pair (public and private keys)before connecting to an SSH server.

✅C. ssh-keygen -t dsa (Correct Answer)

DSA (Digital Signature Algorithm) key generationfor SSH authentication.

Generates aprivate key (id_dsa)and apublic key (id_dsa.pub).