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

Comprehensive and Detailed Explanation:

✔SRv6 (Segment Routing over IPv6) Flavorsprovide additionalprocessing behaviorsfor SRv6End 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 overheadon 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 forBinding Segment (BSID)behavior and does not support PSP.

????Reference:Huawei HCIE Datacom – SRv6 Flavors and End Instructions

Comprehensive and Detailed Explanation:

✔Paramikois a Python library that providesSSH and SFTPfunctionality.

✔The SFTPClient classis specifically designed forSFTP (Secure File Transfer Protocol)operations.

✔How It Works:

ATransport sessionis established using Transport().

AnSFTP sessionis created using SFTPClient.from_transport().

File operations(upload/download) are performed viaSFTP methods.

✔Why Not Other Options?

❌(A) Packetizer class→ Handleslow-level SSH message processing, not SFTP.

❌(C) Channel class→ CreatesSSH channels, not SFTP sessions.

❌(D) Transport class→ EstablishesSSH connections, butdoes not perform file operations.

????Reference:Huawei HCIE Datacom – Python Paramiko and SFTP Implementation

Comprehensive and Detailed In-Depth Explanation:

A. When planning paths based on bandwidth:Correct. The available bandwidth of each interface must beset in advanceto allow path planning based on bandwidth requirements.

B. When planning paths based on delay:Correct. To plan paths considering delay, you need to deployTWAMP (Two-Way Active Measurement Protocol)oriFIT (Intelligent Flow Information Telemetry)to measure thereal-time delayon network links.

C. If the controller plans SR-MPLS Policy paths:Incorrect. The controller can planprimary, backup, and load-balanced paths, enablingtraffic distribution across multiple paths.

D. Statically planned SR-MPLS Policy paths:Correct. You canmanually configure load balancingfor the primary path when planning the SR-MPLS Policy path statically.

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

✔TI-LFA (Topology Independent Loop-Free Alternate)is an enhancedFast Reroute (FRR) mechanismused inSR-MPLSnetworks.

✔How TI-LFA Works:

A virtual node is created, aggregating multiple route advertisements.

Backup paths are precomputedusingSegment Routing (SR) SIDs.

When a link failure occurs, traffic isrerouted in <50mswithout waiting forIGP convergence.

????Reference:Huawei HCIE Datacom – TI-LFA and SR-MPLS TE Protection

NETCONF architecture consists of the following conceptual layers:

Secure Transport Layer – Ensures confidentiality (e.g., SSH, TLS)

Messages Layer – Handles framing and encoding (XML-based)

Operations Layer – Includes , , , etc.

Content Layer – Carries the actual configuration and state data defined by YANG models

This makes Option D correct.

Exact Extract – Huawei HCIE-Datacom NETCONF Architecture Overview:

“NETCONF is divided into four conceptual layers: secure transport, message framing, operations, and content layers.”

Comprehensive and Detailed In-Depth Explanation:

During a network migration test, it is crucial not only to verify that the network itself is functioning correctly but also to ensure thatupper-layer application servicesare running properly on the newly migrated network. Migration testing aims to confirm that the transition has not disrupted service functionality.

Option A and C focus solely on network performance, which is necessary but insufficient.

Option B refers to command outputs, which are technical checks and do not guarantee service continuity.

Option D correctly identifies that successful migration is indicated byproper operation of upper-layer application services, as the primary purpose of a network is to support these applications.

Comprehensive and Detailed Explanation:

✔All four egress modesare supported inHuawei CloudCampus Virtualized Fabricto provideflexibility in connecting external networks.

✔Modes Explained:

✅Layer 3 Shared Egress→ Multiple VNs share asingle Layer 3 gatewayfor external communication.

✅Layer 2 Shared Egress→ Multiple VNs share the sameLayer 2 linkto the external network.

✅Layer 3 Exclusive Egress→ Each VN has its ownseparate Layer 3 gatewayto external networks.

✅Layer 2 Exclusive Egress→ Each VN has its owndedicated Layer 2 linkfor external connectivity.

????Reference:Huawei HCIE Datacom – CloudCampus Fabric Egress Modes

Segment Routing over IPv6 (SRv6) defines several headend behaviors for how SRH (Segment Routing Headers) are added:

B. H.Insert — Inserts an SRH into an existing IPv6 packet.

C. H.Encaps — Encapsulates the original packet in a new IPv6 packet with an SRH.

D. H.Insert.Red — Performs insert behavior and reduces the payload for optimization.

A. H.Encaps.Red is not a defined SRv6 behavior — it’s an invalid option.

Exact Extract - Huawei SRv6 White Paper:

“H.Insert, H.Insert.Red, and H.Encaps are valid behaviors for injecting SRH. H.Encaps.Red is not defined in the SRv6 headend behavior set.”

InSRv6 (Segment Routing over IPv6),flavorsare extensions to standard SRv6 instructions that define how theSegment Routing Header (SRH)is handled at specific points:

PSP (Penultimate Segment Pop): Instructs thepenultimate nodeto remove the SRH before reaching the last node →✅

USD (Ultimate Segment Decapsulation): Instructs thefinal segmenttoremove the SRH and IPv6 header, exposing the payload →✅

PSD (Penultimate Segment Decapsulation): Instructs thepenultimate nodeto remove the SRH and deliver the payload →✅

USP (Ultimate Segment Pop)isnot a standard flavorin Huawei SRv6 implementations →❌

Correct answers: A, B, D