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

Network migration typically includes the followingphases:

Preparation Phase:

Network survey

Migration plan design

Backup

Pre-configuration

Middle Phase (Migration Execution):

On-site monitoring

Migration implementation

Service test (to verify the migration effect)

Post-Migration Phase:

Optimization

Documentation

Final acceptance

Hence,Migration preparationis part of theinitial phase, not themiddle phase.

Correct answer: A. Migration preparation

Comprehensive and Detailed In-Depth Explanation:

By default, OSPF does not automatically associate a domain ID with a process ID. The concept of "domain ID" is primarily used when redistributing routes between OSPF and BGP, particularly in MPLS VPN scenarios. The domain ID in OSPF helps maintain loop prevention and correct route advertisement between different OSPF domains. You can manually configure the domain ID using the domain-id command within the OSPF process view, but it is not inherently set to the process ID.

Huawei iMaster NCE-Campus as an Authentication Relay Agent

HuaweiiMaster NCE-Campuscan act as arelay agentfor authentication services, forwarding authentication requests between users and authentication servers (e.g., RADIUS, LDAP).

✅B. User Authentication

Validates user credentialsbefore granting network access.

Supports802.1X, Portal, MAC, and RADIUS authentication.

✅C. User Analysis

Analyzes user behavior and access patternsto optimize security and network policies.

✅D. Marketing

Providescustomized authentication portalswithadvertisements and promotional messages.

Incorrect Answer:

❌A. User Accounting–Accounting is handled by the authentication server (e.g., RADIUS), not the relay agent.

Reference from Huawei HCIE-Datacom Documentation:

Huawei iMaster NCE-Campus Authentication Guide – Relay Agent Functions

HCIE-Datacom Study Material – User Authentication and Analysis in CloudCampus

Understanding Network Monitoring Data Categories

🔹Network devices operate across three functional planes:

✅A. Management Plane:

Handlesdevice configuration, authentication, and monitoring.

Example:SNMP, SSH, NETCONF logs.

✅B. Data Plane (Forwarding Plane):

Handlespacket forwarding and switching.

Example:Interface statistics, traffic rates, dropped packets.

✅C. Control Plane:

Handlesrouting, signaling, and protocol operations.

Example:BGP, OSPF, and MPLS signaling messages.

❌D. Monitoring Plane (Incorrect Choice):

There is no "monitoring plane" in network architecture.

Monitoring tools collect data frommanagement, control, and data planes, butdo not form a separate plane.

Why is the Answer D (Monitoring-plane data)?

❌Monitoring-plane does not exist as a separate category in network architecture.

✅O&M tools collect data from management, control, and data planes, but do not define a separate "monitoring plane".

Real-World Application:

Huawei iMaster NCE-Campus & iMaster NCE-WANcollect real-timenetwork statistics and alarms.

Network Performance Monitoring (NPM)toolsanalyze control-plane eventsto detect failures.

✅Reference:Huawei HCIE-Datacom Guide – Network Planes and Performance Monitoring

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

Understanding Huawei OPS and HTTP Communication

🔹What is Huawei OPS?

HuaweiOpen Programmability System (OPS)enablesAPI-based network automationusing standardHTTP requests.

It supportsNETCONF, RESTCONF, and RESTful APIsfordevice management.

🔹Why TCP Port 80?

Port 80is thedefault port for HTTP traffic.

Used forweb-based device management, API calls, and telemetry data exchange.

IfHTTPS (secure version) is used, the default port is 443.

Why is the Answer 80?

✅HTTP operates on TCP port 80 by default.

✅Huawei OPS uses HTTP APIs to manage network devices, making port 80 the standard option.

Real-World Application:

Cloud-Native Network Automation:UsesHTTP-based APIs for SDN controllers and automation tools.

Network Device Management:Enablesremote configuration and monitoring over HTTP APIs.

✅Reference:Huawei HCIE-Datacom Guide – Open Programmability System (OPS) & HTTP Communication

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.”

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

Understanding Huawei SD-WAN VN (Virtual Network) Topologies

Huawei SD-WANusesVirtual Networks (VNs)to providetraffic isolation and policy-based routingfor different services, branches, and applications.

🔹VN Topologies Can Be Different

Each VN (Virtual Network) can have its own topology.

Some VNs may usefull-mesh, while others may usehub-and-spokeorstar topology.

Different VNs can havedifferent routing and security policies.

✅Example:

Corporate traffic (VN1)→Full-mesh topologyfor efficient inter-branch communication.

Guest Wi-Fi traffic (VN2)→Hub-and-spoke topologyto restrict inter-site communication.

Why is the Answer FALSE?

❌All VNs do not have to use the same topology.

✅Each VN can be configured independently with a unique topology, routing policy, and security settings.

✅Reference:Huawei HCIE-Datacom Guide – SD-WAN VN Topologies and Segmentation

Comprehensive and Detailed In-Depth Explanation:

When configuring avirtualized campus networkoniMaster NCE-Campus, the platform supports automatic delivery of routing policies when connecting to external networks, including the Internet.

This feature ensures that traffic destined for external networks isautomatically directed to the appropriate egress points.

TheNCE-Campusautomatically creates and delivers thedefault routeor specific routes, depending on the network topology and configuration.

This simplifies network management by eliminating the need for manual route configuration on each device.

Therefore, the statement isTRUE.