Huawei H12-891_V1.0 - HCIE-Datacom V1.0

When selectingcore devicesfor aWANin enterprise networks, considerations typically include:

Service volume: Ensures the core device can handle expected traffic.

Physical location: Important for latency, redundancy, and network design.

Node quantity: Affects topology, scalability, and routing complexity.

Device naming conventions, however, are purely administrative anddo not affectthe functional selection of core devices.

Correct answer: A. Device naming conventions

There arethree standard inter-AS MPLS VPN options, as per RFC 4364:

Option A (Back-to-Back VRF):

VRFs are directly connected between ASBRs using routing exchange (like static/BGP).

No label switching between ASs —no MPLS label neededbetween ASs.

Option B (EBGP Label Exchange):

ASBRs exchange labeled VPNv4 routes via EBGP.

One MPLS label is required —MPLS forwarding across AS boundaryis used.

Option C (End-to-End LSP):

Full end-to-end LSP is created across ASs.

MPLS labels are definitely usedend-to-end, even between ASs.

Option D (Commonly vendor-specific extensions based on Option B/C):

Similar to Option C —requires MPLS labels.

So:

B. Option B— needs MPLS label✅

D. Option D— also needs MPLS label✅

A. Option A—no MPLS label❌

C. Option C— also uses MPLS label✅, but not listed as an answer option in this question format (should have been).

Assuming valid options areA, B, D, the correct ones needing MPLS labels are:

Correct answers: B, D

Understanding Huawei’s Free Mobility Solution

Huawei’sFree Mobility solutionis designed to ensure that users can seamlesslyaccess the networkregardless of their physical location while maintainingconsistent policies.

🔹Key Components in Free Mobility Solution:

1️⃣iMaster NCE-Campus (Answer A - Core Role)

Manages network policies & user access.

Implementscentralized policy control & orchestration.

2️⃣Policy Enforcement Device (Answer B - Core Role)

Ensures thatuser policies (such as QoS, security, VLANs) are applied dynamically.

Typically aswitch or gatewayenforcing access control.

3️⃣Policy Control Device (Answer D - Core Role)

Stores anddynamically assigns policies based on user role & device type.

Works closely withiMaster NCE-Campus.

🔹Why is C (Authentication Device) NOT a Core Role?

❌Authentication devices (such as aRADIUS or AAA server) arenot a core componentof Huawei’sFree Mobilitysolution.

They are part of thebroader network security frameworkbutnot mandatoryfor Free Mobility.

Real-World Application:

Used inenterprise & campus networkswhereemployees, guests, and IoT devices need seamless accesswhile maintaining security policies.

✅Reference:Huawei HCIE-Datacom Guide – Free Mobility Architecture & Policy Management

The command port-isolate enable is used on Huawei switches to completely isolate traffic at both Layer 2 and Layer 3 between different interfaces within the same VLAN. This isolation prevents any communication between isolated ports—even if they belong to the same subnet or VLAN—making it a critical security feature in multi-tenant environments.

Usage Context:

Often used in shared service or hotel network scenarios.

Can be applied in access port configurations.

Does not require additional VLAN creation or private VLAN features.

Huawei Datacom Reference:

"To completely isolate Layer 2 and Layer 3 communication between interfaces in the same VLAN, run the port-isolate enable command under the interface view."

(Source: HCIE-Datacom Study Guide V3.0 – Chapter: VLAN & Security Technologies, Section: Port Isolation)

Comprehensive and Detailed Explanation:

TheOSPF error outputshows:

✔Hello timer mismatch (1 error)→Hello intervals must match for adjacency formation(A)✅

✔No Netmask mismatch errors→Subnet masks are consistent, so option C is incorrect❌

✔No Extern option mismatch→No evidence of area type inconsistency (option D)❌

✔If area IDs were mismatched, adjacency would not form (option B is correct)✅

Thus, the correct answers areA and B.

📖Reference:Huawei HCIE Datacom – OSPF Troubleshooting

To automatically enable MPLS on an interface inSR-MPLS:

Segment routing must be enabled globallyin thesystem view→✅

Segment routing must also be enabled under the IGP process, andIGP (OSPF or IS-IS) must be enabled on the interface→✅

Clarifications:

SRGB (Segment Routing Global Block)configuration defines SID ranges butdoes not trigger MPLS enablement→❌

Static adjacency labelsare advanced options and do not auto-enable MPLS →❌

Correct answers: B, D

Comprehensive and Detailed In-Depth Explanation:

TheiMaster NCE-IP controllerusesTelemetryto collect real-timedevice running statusinformation efficiently and with low latency.

Telemetry (A):Enables continuousdata streamingto the controller, including network performance and link state information.

Telnet (B):Used for manual device management and not suitable for automated data collection.

BGP-LS (C):Used fordistributing link-state information, but not for real-time performance data collection.

IS-IS (D):AnIGP protocol, not used for collecting device status.

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.

Correct Order of Steps:

1️⃣Network planning

2️⃣Site design

3️⃣Device management

4️⃣Fabric management

5️⃣VN (Virtual Network) management

6️⃣Service deployment

Understanding the iMaster NCE-Campus Deployment Process

🔹iMaster NCE-Campus is Huawei’s AI-driven network automation and management platform for campus networks.

🔹The deployment follows a structured sequence to ensure a fully operational network.

Detailed Explanation of Each Step:

✅1️⃣Network Planning(First Step)

Defines the overallnetwork architecture, topology, and business requirements.

DeterminesWAN, LAN, and WLAN coveragefor the campus.

EnsuresIP addressing, VLANs, and security policiesare planned.

✅2️⃣Site Design(Second Step)

Createssite layoutsand determinesdevice placement(switches, APs, routers).

Definespower, cabling, and uplink requirementsfor optimal connectivity.

✅3️⃣Device Management(Third Step)

Onboards network devices (e.g., switches, APs, firewalls) into iMaster NCE-Campus.

Configuresinitial settingssuch asIP addresses, interfaces, and SNMP settings.

Ensuresdevices are registered and reachablein the management platform.

✅4️⃣Fabric Management(Fourth Step)

EstablishesVXLAN-based network fabricforautomated Layer 2/3 connectivity.

ConfiguresEVPN/VXLAN overlays, VTEPs, and underlay routing.

✅5️⃣VN (Virtual Network) Management(Fifth Step)

Definesvirtual networks (VNs) for different departments, tenants, or services.

ConfiguresQoS, ACLs, and network segmentation policies.

✅6️⃣Service Deployment(Final Step)

Activatesnetwork services like DHCP, security policies, and application access.

Ensures thatend-user connectivity and application traffic policies are in place.

Why Is This the Correct Order?

✅Each step builds upon the previous one, ensuring a smooth and structured deployment process.

✅Service deployment comes last because it finalizes user access and application connectivity.

Real-World Application:

Enterprise Campus Networks:Deployssecure, scalable campus connectivity with AI-based automation.

University Campuses & Smart Cities:UsesSDN-driven network segmentation and automationto simplify operations.

✅Reference:Huawei HCIE-Datacom Guide – iMaster NCE-Campus Deployment & Automation