H19-402_V1.0 Exam Dumps - HCSP-Presales – Data Center Network Planning and Design V1.0

In Huawei routing principles, route selection follows a strict hierarchy. When multiple routing protocols advertise routes to the same destination, the system first compares the route preference (priority) , not the cost. The route with the lowest preference value (highest priority) is selected. Only within the same routing protocol are cost/metric values compared to determine the best route.

Option A is correct because only one optimal route is installed in the routing table at a time, based on protocol preference. Option B is also correct: direct routes are automatically generated for networks connected to local interfaces. Option C is valid as Huawei devices support route import (redistribution) between routing protocols, enabling flexible network design.

Option D is incorrect because it reverses the decision logic. It incorrectly states that cost is compared before priority, which contradicts Huawei’s routing selection process.

Therefore, the false statement is D .

Huawei’s AI Fabric solution is designed to build a unified, intelligent lossless data center network by integrating traditionally separate network infrastructures into a single converged Ethernet-based fabric.

The three integrated networks are:

Computing network (C): Handles east-west traffic between compute nodes (e.g., AI training clusters, GPU servers).

Storage network (B): Supports high-throughput, low-latency storage access (e.g., distributed storage systems like HDFS or Ceph).

Ethernet network (D): Provides the underlying IP-based transport, enabling unified connectivity and scalability.

Traditionally, InfiniBand (IB) networks were used for high-performance computing due to their low latency and RDMA capabilities. However, Huawei AI Fabric replaces IB with lossless Ethernet (RoCE-based) solutions, allowing all services (compute + storage + management) to run over a single Ethernet fabric .

This convergence reduces:

Network complexity

Capital and operational costs

Management overhead

While improving:

Resource utilization

Scalability

Automation

Therefore, the correct three networks are Storage, Computing, and Ethernet , making B, C, and D correct .

In Huawei data center networking, M-LAG (Multi-Chassis Link Aggregation Group) is a critical technology used to provide active-active access, high availability, and link redundancy . It allows a downstream device (such as a server) to establish a single logical Eth-Trunk across two separate physical switches (DeviceA and DeviceB).

From the server’s perspective, both upstream switches appear as one logical device , which eliminates the need for protocols like STP and enables simultaneous forwarding on all active links . This significantly improves bandwidth utilization and avoids blocked links.

The key advantage highlighted in the statement is the improvement of reliability from card-level to device-level . In traditional single-device link aggregation, failures are limited to interface cards. However, with M-LAG, even if an entire switch (device-level failure) goes down, traffic continues to flow through the other active switch without interruption.

Huawei CloudFabric widely adopts M-LAG + VXLAN EVPN to ensure high reliability, fast convergence, and continuous service availability .

Therefore, the statement is TRUE .

In Huawei CloudFabric architecture, the underlay network is the physical IP network that provides basic connectivity and routing reachability for overlay services such as VXLAN.

Option A is correct : the underlay acts as the bearer (transport) network for VXLAN traffic, carrying encapsulated packets between VTEPs.

Option B is correct : the underlay includes both NVE (Network Virtualization Edge) devices that perform VXLAN encapsulation/decapsulation and standard IP forwarding devices (e.g., spine switches).

Option C is correct : the underlay has its own independent control plane , typically using IGP (OSPF/IS-IS) or BGP (EBGP) , and operates independently from the overlay (EVPN).

Option D is false because the underlay network is fundamentally responsible for Layer 3 IP reachability between VTEPs. Without proper L3 routing in the underlay, VXLAN tunnels cannot be established.

Huawei best practices emphasize a simple, stable, and highly reliable underlay , as it is the foundation for all overlay services.

Therefore, the correct answer is D .

In Huawei CloudFabric architecture, server leaf nodes and service leaf nodes have distinct roles, even though both can function as NVEs (Network Virtualization Edge devices) in a VXLAN network.

A server leaf node primarily provides access for compute resources , such as physical servers and virtual machines. It acts as a common NVE, handling VXLAN encapsulation/decapsulation for tenant traffic and enabling communication within the overlay network.

However, firewalls and load balancers (LBs) are classified as value-added service (VAS) devices and are typically connected to service leaf nodes , not standard server leaf nodes. Service leaf nodes are specifically designed to handle service insertion, traffic steering, and policy-based forwarding required for these devices.

Although in some simplified deployments roles may be combined, Huawei standard design clearly separates:

Server leaf → compute access

Service leaf → VAS device access (FW, LB, etc.)

Therefore, the statement is FALSE , as server leaf nodes do not typically provide access for firewalls and load balancers in standard CloudFabric architecture.