H19-402_V1.0 Exam Dumps - Huawei HCSP Presales Questions and Answers

In OpenStack Neutron, the core network abstraction models are Network, Subnet, and Port , which align with Huawei CloudFabric’s logical network design principles. A Network represents a Layer 2 broadcast domain, similar to a VXLAN segment (VNI) in Huawei data center fabrics. It provides tenant-level isolation and forms the foundation for overlay networking.

A Subnet defines the Layer 3 IP addressing scheme within a network, including CIDR blocks, gateway addresses, and DHCP configurations. This aligns with Huawei’s underlay/overlay separation, where IP addressing is critical for both service reachability and automation.

A Port is the connection point between a virtual machine (VM) and the virtual network, equivalent to a virtual NIC. It carries MAC/IP bindings and security policies, similar to endpoint definitions in EVPN-based fabrics.

The option vRouter is incorrect because Neutron uses the concept of a Router , not “vRouter,” and it is considered a higher-layer service component rather than a fundamental network model. Huawei documentation consistently emphasizes these three as the foundational constructs for virtualized network design.

In Huawei CloudFabric architecture, logical switches are a key abstraction used to simplify network service deployment and management. These logical switches are built on top of VXLAN Layer 2 networks and represent virtualized broadcast domains (similar to VLANs, but more scalable).

Huawei extends the function of these logical switches by integrating distributed Layer 3 gateway capabilities directly into them. This means that each logical switch can provide both Layer 2 connectivity and Layer 3 routing services (commonly referred to as distributed gateways). These gateways are typically implemented on leaf nodes using VXLAN with BGP EVPN as the control plane.

As a result, traffic between subnets can be routed locally at the ingress leaf switch without needing to traverse to a centralized gateway, significantly improving efficiency and reducing latency. Logical ports connected to these logical switches automatically receive gateway services, enabling seamless inter-subnet communication.

This design aligns with Huawei’s intent of decoupling physical and logical networks while providing scalable, agile, and highly efficient data center networking. Therefore, the statement is TRUE.

According to Huawei’s CloudFabric intelligent O & M description, the health model is built as a multi-dimensional evaluation system that assesses the network from five dimensions: device, network, protocol, overlay, and service . This means every option listed in the question is part of the CloudFabric health model. Huawei explains that this model integrates telemetry-assisted data such as configuration data, forwarding entry data, logs, and KPI performance information, allowing the platform to detect faults and risks in real time across these five layers.

In practical Huawei CloudFabric operations, the device layer focuses on node health, hardware state, and resource status; the network layer checks connectivity and path quality; the protocol layer verifies control-plane protocols and convergence behavior; the overlay layer evaluates virtualized forwarding networks such as VXLAN fabrics; and the service layer measures the actual service experience and traffic exchange status. Huawei explicitly presents these five as the full health-evaluation scope of CloudFabric intelligent O & M, so the correct response is all five options

In Huawei networking, Eth-Trunk (link aggregation) can operate in two modes: manual mode and LACP mode . In manual mode , the Eth-Trunk is statically configured by the administrator, and member interfaces are manually added without using the Link Aggregation Control Protocol (LACP) .

In this mode, all member links that are up are considered active by default , and they simultaneously participate in traffic forwarding and load balancing . Traffic distribution is typically based on hash algorithms (e.g., source/destination MAC or IP), ensuring efficient utilization of available bandwidth.

Unlike LACP mode, manual mode does not perform dynamic negotiation or link state detection between devices. Therefore, it requires consistent configuration on both ends to avoid issues such as loops or traffic blackholing. However, it is simpler and can be useful in controlled environments.

In Huawei data center designs, especially in M-LAG scenarios , LACP is generally preferred for better reliability and fault detection. Still, the statement accurately describes manual mode behavior.

Therefore, the statement is TRUE .

Huawei’s Intelligent Lossless Data Center Network is specifically designed to meet the stringent requirements of AI computing workloads , which generate massive east-west traffic and exhibit bursty communication patterns such as incast scenarios . Therefore, traffic control in incast scenarios (A) is a critical requirement to prevent buffer overflow and packet loss.

Fast and efficient load balancing (B) is also essential, as AI training jobs rely on distributed computing across multiple nodes. Technologies like ECMP and flowlet-based load balancing ensure even traffic distribution and optimal link utilization.

Quick congestion control (C) is another key requirement. Mechanisms such as PFC (Priority Flow Control) and ECN (Explicit Congestion Notification) are used in Huawei CloudFabric to achieve near lossless transmission, which is vital for RDMA-based AI workloads.

However, High-performance computing (HPC) (D) is not a network requirement—it is an application and compute domain concept . While AI workloads may run on HPC systems, HPC itself is not a characteristic or requirement of the network.

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.

In Huawei’s intelligent O & M architecture, NETCONF is a modern network management protocol designed for transactional, reliable, and concurrent-safe configuration management . One of its key features is the lock mechanism , which allows a user or system to lock a configuration datastore (such as candidate or running configuration) to prevent other users or processes from making conflicting changes simultaneously. This ensures consistency, atomic operations, and rollback capability , which are critical in automated data center environments like CloudFabric.

On the other hand, SNMP (Simple Network Management Protocol) is primarily designed for monitoring and basic configuration , but it lacks advanced transaction control features. SNMP does not support configuration locking or transactional commits, meaning multiple users can overwrite each other’s changes, potentially leading to configuration inconsistencies.

Huawei strongly recommends using NETCONF/YANG-based automation (e.g., via iMaster NCE-Fabric) for modern data center operations because it provides structured data modeling, conflict prevention, and programmability , which SNMP cannot offer.

Therefore, the statement is TRUE .

In Huawei CloudFabric intelligent O & M (Operations and Maintenance), multiple southbound data collection protocols are supported to enable comprehensive monitoring, analysis, and fault diagnosis. Commonly supported protocols include Telemetry, SNMP, NetStream, and ERSPAN .

Telemetry is the primary modern mechanism, providing real-time streaming data with high accuracy and low latency. SNMP is used for traditional device monitoring and alarm collection. NetStream (Huawei’s implementation of NetFlow) is used for traffic analysis, while ERSPAN enables remote traffic mirroring for deep packet inspection and troubleshooting.

However, Qx is not a standard or supported southbound protocol in Huawei CloudFabric O & M architecture. It is not referenced in Huawei documentation as a mechanism for data collection or monitoring.

Therefore, option B is correct because it identifies the protocol that is not supported , while all other options are valid and commonly used in Huawei intelligent O & M solutions.