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

IS-IS was originally designed for IPv4, but extensions via TLVs (Type-Length-Value) allow it to support IPv6. These are referred to as New IS-IS TLVs, including TLV 236 (IPv6 Reachability), TLV 232 (IPv6 Interface Address), etc. These TLVs are crucial for IPv6 route computation within IS-IS.

Exact Extract - HCIE-Datacom Guide – IPv6 Routing Protocols Chapter

“IS-IS uses new TLVs such as TLV 236 and TLV 232 to carry IPv6 prefix and interface address information. These TLVs are essential to enable IPv6 route calculation.”

Correct Order of Steps:

1️⃣ Network planning

2️⃣ Site design

3️⃣ Device management

4️⃣ Fabric management

5️⃣ VN (Virtual Network) management

6️⃣ Service 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:

✅ 1️⃣ Network Planning (First Step)

Defines the overall network architecture, topology, and business requirements.

Determines WAN, LAN, and WLAN coverage for the campus.

Ensures IP addressing, VLANs, and security policies are planned.

✅ 2️⃣ Site Design (Second Step)

Creates site layouts and determines device placement (switches, APs, routers).

Defines power, cabling, and uplink requirements for optimal connectivity.

✅ 3️⃣ Device Management (Third Step)

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

Configures initial settings such as IP addresses, interfaces, and SNMP settings.

Ensures devices are registered and reachable in the management platform.

✅ 4️⃣ Fabric Management (Fourth Step)

Establishes VXLAN-based network fabric for automated Layer 2/3 connectivity.

Configures EVPN/VXLAN overlays, VTEPs, and underlay routing.

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

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

Configures QoS, ACLs, and network segmentation policies.

✅ 6️⃣ Service Deployment (Final Step)

Activates network services like DHCP, security policies, and application access.

Ensures that end-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: Deploys secure, scalable campus connectivity with AI-based automation.

University Campuses & Smart Cities: Uses SDN-driven network segmentation and automation to simplify operations.

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

Comprehensive and Detailed Explanation:

The display current-configuration command is used to show the active running configuration stored in RAM (memory).

Key Features:

✔ Displays current settings for interfaces, routing, and security.

✔ Reflects real-time changes (different from startup-config stored in NVRAM).

✔ Useful for troubleshooting and verification before saving configurations.

Thus, the statement is TRUE.

📖 Reference: Huawei HCIE Datacom – Command Reference Guide

Error analysis:

The error SSLError and CertificateError indicates the server ' s SSL certificate ' s hostname doesn ' t match the IP address being used in the request.

This happens when a certificate is issued for a domain (like devzone.huawei.com), but the client accesses it via an IP address (139.9.213.72), causing a trust failure.

Correct statements:

A — ✅: The client doesn ' t trust the SSL certificate → correct.

B — ✅: SSL verification fails due to hostname mismatch.

C — ✅: Disabling verification with verify=False bypasses the check (only recommended in lab/testing environments).

D — ❌: Uses http instead of https, which changes protocol and defeats the purpose of SSL. Also uses POST without API path.

Correct answers: A, B, C

PQ (Priority Queuing) ensures low-latency services like voice and video are prioritized.

WFQ (Weighted Fair Queuing) fairly allocates remaining bandwidth to services like FTP.

Option B provides a balanced approach: guarantees for voice/video via PQ, and fairness for FTP via WFQ.

Exact Extract - Huawei HCIE-Datacom QoS Module:

“Voice and video traffic should be handled by PQ to minimize delay and jitter. Non-critical services such as FTP should be placed in WFQ queues to ensure bandwidth fairness.”

Comprehensive and Detailed Explanation:

✔ Breakdown of the Python Code:

✅ (A) Correct → The function r.json() can be used to display the server response (token details).

✅ (B) Correct → The token request URL is correct.

✅ (D) Correct → The request body is in JSON format (json={ " userName " : nbi_name, " password " : nbi_pwd " }).

❌ (C) Incorrect → The request uses POST, not GET (requests.post() is explicitly called).

📖 Reference: Huawei HCIE Datacom – iMaster NCE RESTful API Authentication

Comprehensive and Detailed In-Depth Explanation:

In OSPFv3, the AS-external-LSA (Type 5 LSA) is the only LSA type that can be flooded throughout the entire Autonomous System (AS). It is used to advertise external routes (routes redistributed from other routing protocols or static routes) into the OSPF domain.

B. Intra-Area-Prefix-LSA (Type 9): Used to advertise IPv6 prefixes within an OSPF area, not across the AS.

C. Link-LSA (Type 8): Advertises link-local addresses and options, only within the local link, not the entire AS.

D. Inter-Area-Prefix-LSA (Type 3 or Type 4): Advertises prefixes between OSPF areas but not throughout the entire AS.

Only AS-external-LSAs (Type 5) can be propagated across the whole OSPF AS, making them essential for exchanging routes learned from other routing protocols.

To automatically enable MPLS on an interface in SR-MPLS:

Segment routing must be enabled globally in the system view → ✅

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

Clarifications:

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

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

Correct answers: B, D

Let’s break this down step-by-step based on Huawei IS-IS VPN and multi-process behavior.

🔹 Configuration Summary:

Process 1: IS-IS for the global routing table

Process 2: IS-IS for VPN instance tt

Process 3: IS-IS for VPN instance rr

✅ Option C: Correct

Process 1 contains only global routing information.

The configuration of isis 1 does not include any vpn-instance keyword, meaning it is bound to the global routing table.

It does not interact with VPN routing tables unless explicitly configured with import/export mechanisms or route leaking (which is not shown here).

Huawei Datacom Reference:

“When an IS-IS process is not associated with a VPN instance, it belongs to the global routing table and only maintains global routes.”

(Source: HCIE-Datacom Study Guide v3.0 – Chapter: IS-IS for IPv4 and IPv6, Section: Multi-Instance Routing)

✅ Option D: Correct

Routing information of process 2 is isolated from that of process 3.

isis 2 is bound to VPN instance tt

isis 3 is bound to VPN instance rr

Each IS-IS process in Huawei VRF context maintains independent LSDBs and routing tables, and by default, they do not share routing information unless route leaking or redistribution is configured (which is not shown in the config).

Huawei Datacom Reference:

“IS-IS processes bound to different VPN instances operate independently and do not share routing information.”

(Source: HCIE-Datacom Study Guide v3.0 – Chapter: MPLS L3VPN with IS-IS)

The Time-To-Live (TTL) field in MPLS is essential for preventing infinite loops and enhancing security.

MPLS TTL Field Functionality:

It prevents packets from circulating indefinitely in the MPLS network.

It allows traceroute (tracert) to identify MPLS hops when TTL propagation is enabled.

Explanation of Correct Answers:✅ B. The processing of IP TTL copy hides the LSR in an MPLS domain, improving security.

If TTL propagation is disabled, MPLS routers do not decrease TTL, hiding internal LSRs from traceroute, enhancing security.

✅ C. MPLS provides two TTL processing modes:

Default Mode: The MPLS TTL copies the IP TTL value when an IP packet enters the MPLS network.

Uniform Mode: The ingress LER sets the MPLS TTL to 255, so it does not decrement.

✅ D. MPLS encapsulation in frame mode supports the TTL field, while cell mode does not.

Frame Mode (Ethernet, PPP, etc.) supports TTL.

Cell Mode (ATM/MPLS) does not support TTL.

Incorrect Answer Explanation:❌ A. If TTL copy is disabled, users can use the tracert function to view MPLS hops.

Wrong! If TTL propagation is disabled, tracert cannot see LSRs inside the MPLS core network.

Reference from Huawei HCIE-Datacom Documentation:

Huawei MPLS Technology Guide – TTL Field & Loop Prevention

HCIE-Datacom MPLS VPN Configuration Guide – Traceroute in MPLS Networks