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

For SRv6 (Segment Routing over IPv6) deployment on a bearer WAN, the following are essential:

IGP (OSPFv3 or IS-IS): Required for SID advertisement and SRv6 route computation → ✅

BGP: Required when deploying inter-domain SRv6 or for control plane distribution of VPN/service routes → ✅

Not required:

MPLS: SRv6 replaces MPLS labels with IPv6-based SIDs → ❌

BGP-LU: Used in MPLS-based inter-AS scenarios, not applicable to SRv6 → ❌

Correct answers: B, C

Stateless Address Autoconfiguration (SLAAC) is an IPv6 mechanism where a host automatically configures its own global unicast address without requiring a DHCPv6 server.

IPv6 Address Format in SLAAC:

First 64 bits → Network Prefix (received from the router ' s RA message).

Last 64 bits → Interface Identifier (generated using EUI-64 or a randomly assigned value).

Why is the Prefix Always 64 Bits?

SLAAC requires a /64 prefix because the host needs the lower 64 bits to generate a unique address.

IPv6 Neighbor Discovery (ND) and Address Autoconfiguration are designed for a /64 subnet mask.

Reference from Huawei HCIE-Datacom Documentation:

Huawei IPv6 Configuration Guide – SLAAC Addressing and Prefix Allocation

HCIE-Datacom Training Material – IPv6 Stateless Address Autoconfiguration (SLAAC)

In hot standby (active-active/load balancing) scenarios, Quick Session Backup is critical. This function ensures that session entries are immediately synchronized between firewalls to handle asymmetric traffic (where return traffic goes through a different firewall than the forward traffic).

Without it, the return packet may be dropped due to missing session information on the alternate firewall.

Exact Extract - HCIE-Datacom Security Module:

“When VGMP is in load balancing mode, quick session backup must be enabled to prevent traffic loss due to inconsistent forward and return paths.”

Comprehensive and Detailed In-Depth Explanation:

After Portal authentication on a wireless network, the following parameters can be used for authorization:

free-rule (A): Allows traffic even before authentication.

UCL (B): User Control List, specifying user permissions.

ACL (D): Access Control List, defining permitted or denied traffic.

The IP address (C), however, is not used as an authorization parameter directly. Instead, IP addresses are typically assigned after successful authentication, and the control policies are applied based on user profiles or access lists.

Comprehensive and Detailed Explanation:

✔ Breakdown of the NETCONF Configuration:

✅ (B) Huawei-YANG Model Used: The namespace contains http://www.huawei.com/netconf/vrp/huawei-vlan, indicating Huawei ' s YANG model.

✅ (C) VLAN 10 is Created: < vlanId > 10 < /vlanId > confirms VLAN 10 is configured.

✅ (D) Merge Operation Used: The xc:operation= " merge " tag ensures changes are merged rather than replacing the entire config.

❌ (A) Incorrect: The < edit-config > operation modifies the running configuration, not the startup configuration.

???? Reference: Huawei HCIE Datacom – NETCONF Configuration Management

Comprehensive and Detailed Explanation:

✔ iMaster NCE-WAN is the centralized SD-WAN controller that:

Manages SD-WAN network devices (CPEs, routers).

Optimizes traffic steering using AI-driven policies.

Enables automation, security, and analytics.

Thus, the statement is TRUE.

???? Reference: Huawei HCIE Datacom – SD-WAN Architecture

Understanding iMaster NCE-Campus Terminal Identification

Huawei ' s iMaster NCE-Campus is an AI-driven network management platform for campus networks.

???? Terminal Identification Features in iMaster NCE-Campus

Identifies device type (e.g., Laptop, Mobile, IoT device).

Detects Operating System (Windows, Linux, Android, iOS).

Determines manufacturer information (Huawei, Apple, Cisco, Dell).

Uses AI-based profiling to continuously update device fingerprints.

???? Real-World Application:

Improved security policies (Only authorized devices can access the network).

QoS and network optimization based on device type.

Dynamic access control based on OS and manufacturer.

✅ Reference: Huawei HCIE-Datacom Guide – AI-Driven Campus Networks with iMaster NCE

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.

Comprehensive and Detailed Explanation:

BGP EVPN Type 3 routes are used for VXLAN ingress replication and BUM (Broadcast, Unknown unicast, and Multicast) traffic forwarding.

✔ Type 3 routes contain L2VNIs, not L3VNIs → (C is incorrect)

Key Functions of Type 3 Routes:

Distribute VTEP IP addresses to establish VXLAN tunnels.

Include L2VNIs for mapping Layer 2 broadcast domains.

Used in Ingress Replication for BUM traffic.

Since Type 3 routes do not carry L3VNIs, the correct answer is C.

???? Reference: Huawei HCIE Datacom – BGP EVPN Type 3 Routes

Understanding the Routing Table Entries on R4

0.0.0.0/0 (Default Route) is installed twice in the routing table.

The NextHop values for the default route:

10.1.24.1 (GigabitEthernet0/0/1)

10.1.34.1 (GigabitEthernet0/0/0)

Cost: Both routes have a metric (Cost) of 10, meaning they are equal-cost routes.

Protocol: ISIS-L1 (Intermediate System to Intermediate System - Level 1) confirms these routes are coming from IS-IS routing.

Flags: D (Dynamic) means these routes were dynamically learned via IS-IS.

Why is Option D Correct?

Since both routes have the same cost (10), they are considered equal-cost default routes.

The router will use both routes in a load-sharing fashion.

The answer is NOT A (Four equal-cost routes) because there are only two default routes, not four.

The answer is NOT B (One default route) because there are two default routes in the table.

The answer is NOT C (Two default routes with different costs) because both routes have the same cost (10).

Real-World Application

Equal-Cost Multi-Path (ECMP): The router can perform load balancing across the two equal-cost paths.

Resilience & Redundancy: If one link fails, the other can take over without re-calculating the entire routing table.

✅ Reference: Huawei HCIE-Datacom Study Guide – IS-IS Routing & ECMP Load Balancing