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

The Protocol Trace function of iMaster NCE-CampusInsight allows O&M teams to analyze the full packet exchange process (e.g., DHCP, authentication, IP acquisition) between clients and the network. In this scenario, it helped pinpoint DHCP address pool exhaustion as the cause.

Exact Extract - Huawei iMaster NCE-CampusInsight Product Documentation:

“The Protocol Trace function visualizes packet-level interaction processes for DHCP, ARP, 802.1X, and others, allowing fast identification of root causes for network access issues.”

In MPLS LDP, there are two types of sessions:

Direct LDP sessions: Established between directly connected LSRs using LDP Hellos over a link.

Remote LDP sessions (also called targeted LDP sessions): Established between non-directly connected LSRs. These requiremanual configurationof the remote peer.

In this scenario, SWA and SWC arenot directly connected, so aremote (targeted) LDP sessionmust be set up.

For a remote LDP session:

Youmust configure the remote peerusing the command:

[SWA-MPLS-LDP] targeted-peer x.x.x.x

Where x.x.x.x is theLSR ID of SWC(33.3.3.3 in this case).

The current configuration does not include this required step.

Thus, the correct statement is:

D. You need to create a remote peer and specify an LSR ID for the remote peer.

Huawei Datacom Reference:

“In RESTful APIs, GET is used for reading data, POST for creation, PUT/PATCH for updates, and DELETE for deletion. PATCH allows partial updates while PUT replaces the entire resource.”

(Source: HCIE-Datacom V1.0 – OPS & NETCONF API Chapter)

Understanding BGP Link State (BGP-LS)

????What is BGP-LS?

BGP-LS (BGP Link-State)is anextension of BGPthat allows routers to exchangenetwork topology informationviaLink-State NLRI.

HelpsSDN controllers and path computation elements (PCEs)makeintelligent routing decisions.

????What Does BGP-LS Advertise?

✅Node Information– Router IDs, Loopbacks

✅Link Information– Bandwidth, Delay, Cost

✅Prefix Information– Network Subnets

✅Topology Information– Full network graph

Why is the Answer TRUE?

✅BGP-LS introduces a new NLRI formatfor advertising link-state information.

✅NLRI (Network Layer Reachability Information) is used to distribute topology datato SDN controllers.

✅It improves path optimization by enabling centralized traffic engineering decisions.

Real-World Application:

SDN-Based Traffic Engineering:Used inSegment Routing (SR)networks for centralizedpath selection.

MPLS TE (Traffic Engineering):Optimizes network paths dynamically based onreal-time link-state data.

✅Reference:Huawei HCIE-Datacom Guide – BGP Link-State (BGP-LS) Fundamentals

Huawei Open Programmability System (OPS) and HTTP Request Headers

HuaweiOPSallowsnetwork automation and programmabilitythroughHTTP-based APIs. When using Python scripts to sendHTTP requests to network devices, the requestheaders must specify the content formatfor data exchange.

✅B. Content-Type: text/json, Accept: text/json (Correct Answer)

Content-Type: text/json→ Specifies that the request bodycontains JSON-formatted data.

Accept: text/json→ Specifies that theresponse should be in JSON format.

In YANG model syntax:

cpu-info can be a list node (✓)

cpu-infos can be a container node (✓)

The sampling path does follow the YANG model hierarchy (✓)

However, the prefix huawei-debug: indicates the YANG module name, not an actual data node. Therefore, debug is not necessarily the top node in the YANG hierarchy — it is a node under the huawei-debug namespace/module.

Exact Extract – Huawei Telemetry and YANG Modeling Guide:

“The format : is used in telemetry to indicate paths. The actual top-level node may differ from the module name.”

In Huawei’s CloudCampus Solution, when static IPsec VPN is used for WAN interconnection, the following devices are capable of acting as egress gateways for encrypted tunnels:

Access Point (AP)

Router

Switch

This is based on Huawei’s CloudCampus architecture, where all three device types can support VPN tunnel termination depending on the deployment size and use case.

Huawei Datacom Reference:

"In static IPsec VPN networking scenarios, egress devices can be APs, Routers, or Switches depending on the deployment model. This allows flexibility for small, medium, and large-scale branches."

(Source: HCIE-Datacom V1.0 Training Guide – WAN Interconnection and VPN Chapter)

Comprehensive and Detailed Explanation:

✔Hub-Spoke networkingis the mostefficient and scalablemodel for interconnecting100+ branchesin asmall and midsize campus network.

✔Why Hub-Spoke?

Centralized Control:Ahub routermanages communication betweenspoke routers(branch sites).

Reduced Complexity:Unlikefull-mesh, which requiresN(N-1)/2* connections,hub-spoke minimizes link costs.

Easier Management:Policy enforcement and security are centralized at thehub site.

✔Why Not Other Options?

❌A (Direct Networking)→ Suitable forsmall networks, but inefficient for100+ branches.

❌B (Full-Mesh Networking)→ Highcost and complexity, requiringtoo many links.

❌D (Partial-Mesh Networking)→ More scalable thanfull-mesh, buthub-spoke is more optimizedfor large branch networks.

????Reference:Huawei HCIE Datacom – WAN Interconnection Models

Comprehensive and Detailed Explanation:

Inter-AS MPLS L3VPN solutions enable communication between differentAutonomous Systems (AS)while maintaining VPN separation. The three primary solutions for inter-AS MPLS L3VPN are:

Option A (Back-to-Back VRF)

MPLS isnot requiredbetween ASBRs.

VPN routes are exchangedwithout label switching.

Each ASBR has aVRF instanceconfigured and forwards traffic usingplain IP routing.

Option B (eBGP Redistribution of Labeled VPNv4 Routes)

MPLSis not requiredbetween ASBRs.

ASBRsexchange labeled VPNv4 routes using eBGP.

The ASBR doesnot perform label switchingbut simply forwards packets based on VPNv4 labels.

Option C (Multi-Hop MP-BGP for VPNv4 Routes)

MPLS is requiredbetween ASBRs.

ASBRs establishlabel-switched paths (LSPs)to forward VPN traffic across AS boundaries.

SinceOption Brelies onlabeled VPNv4 routes via eBGPand does not need MPLS between ASBRs, the correct answer isD.

????Reference:Huawei HCIE Datacom Study Guide - MPLS VPN Inter-AS Solutions

Comprehensive and Detailed In-Depth Explanation:

Blackhole MAC address configuration is a security feature that helps protect a network from MAC address spoofing or attacks involving untrusted MAC addresses. When you configure a MAC address as ablackhole MAC address, any packet received with that address as the source or destination will be immediately discarded by the device.

This feature is useful in scenarios where certain MAC addresses are identified as malicious or untrusted. By adding these MAC addresses to the blackhole list, the device effectively blocks communication involving these addresses, thereby mitigating security risks.