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

Huawei’s data center design guidelines emphasize that spine-leaf architecture is a flattened, two-layer fabric designed to overcome the limitations of traditional three-tier networks. One of its key advantages is low and predictable oversubscription ratios , achieved through equal-cost multi-path (ECMP) forwarding and uniform link distribution.

Option A is correct as an advantage because spine-leaf enables resource pooling across zones , eliminating isolated silos and improving utilization. Option C is also a core benefit: the architecture provides high reliability, redundancy, and scalable east-west traffic capacity , which is critical for cloud and distributed applications. Option D reflects the fundamental design principle where each leaf connects to multiple spine switches , ensuring full-mesh reachability and consistent latency.

However, Option B states that the architecture has a high oversubscription ratio , which contradicts Huawei best practices. In fact, spine-leaf is specifically designed to minimize oversubscription , ensuring balanced traffic and predictable performance.

Therefore, B is not an advantage , making it the correct answer.

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 .

In Huawei CloudFabric architecture, the underlay network is the physical IP fabric, while the overlay network is a logical network built on top of it using technologies like VXLAN and BGP EVPN .

Option A is false because the overlay network does not require bare optical fibers . It operates independently of the physical medium and can run over any IP-based underlay (Ethernet, optical, etc.). The overlay abstracts the physical infrastructure.

Option B is correct : the underlay network is transparent to endpoints (servers, firewalls, routers). These devices only interact with the overlay and are unaware of the underlying transport.

Option C is correct : the overlay has its own forwarding plane (VXLAN encapsulation) and control plane (BGP EVPN) , enabling scalable and automated network virtualization.

Option D is correct : the overlay is a logical network built over the underlay , providing tenant isolation and flexible service deployment.

Huawei best practices emphasize decoupling overlay from underlay , ensuring flexibility, scalability, and simplified operations.

Therefore, the correct answer is A .

Huawei data center solutions emphasize the transition toward all-flash data centers as a key enabler of enterprise digital transformation. Traditional HDD-based storage systems cannot meet the performance requirements of modern applications such as AI, big data analytics, cloud computing, and real-time services .

SSD (Solid-State Drive) technology provides significant advantages over HDDs, including:

Ultra-low latency (microseconds vs milliseconds)

High IOPS (Input/Output Operations Per Second)

Better reliability and durability (no mechanical parts)

Lower power consumption and higher density

As a result, SSDs have become the mainstream storage medium in modern data centers, especially in Huawei’s all-flash storage solutions (e.g., OceanStor Dorado) .

All-flash data centers enable:

Faster application response times

Improved user experience

Efficient support for AI and distributed workloads

Simplified storage architecture

Huawei promotes integrating all-flash storage with intelligent lossless networks (RoCE-based) to achieve end-to-end high-performance infrastructure.

Therefore, the statement is TRUE .

Huawei CloudFabric supports multiple data center interconnection (DCI) solutions to meet different scalability and geographic deployment requirements.

Multi-PoD (A) is supported and is used within a single data center to divide it into multiple Pods for modular expansion. It enables large-scale resource pooling while maintaining consistent architecture and simplified management.

Multi-Site (C) is a key CloudFabric capability, allowing multiple geographically distributed data centers to interconnect. This supports disaster recovery (DR), geo-redundancy, and workload migration , often implemented using EVPN/VXLAN across sites.

Multi-DC (D) is a broader concept encompassing interconnection between multiple data centers, including active-active and active-standby designs. Huawei supports this through DCI solutions integrated with CloudFabric , ensuring seamless service continuity.

Multi-VPC (B) is not a standard Huawei CloudFabric multi-DC interconnection model; it is more commonly associated with public cloud networking concepts rather than Huawei’s data center fabric architecture.

Therefore, the correct answers are A, C, and D , which represent the supported multi-data-center interconnection solutions in Huawei CloudFabric.

In Huawei CloudFabric and VXLAN-based overlay networking, the overlay provides abstraction, flexibility, and scalability by decoupling logical services from the physical infrastructure. NVEs (Network Virtualization Edge nodes) can indeed be deployed on physical switches (such as leaf switches), which is a fundamental capability of hardware-based VXLAN fabrics. Additionally, overlay networks are designed to meet the needs of private cloud environments, offering high performance, simplified O & M, and enhanced security through network segmentation (e.g., VXLAN VNIs).

Overlay networks also support access for both virtual machines and physical servers, ensuring consistent connectivity regardless of workload type.

However, statement D is incorrect. In Huawei’s architecture, especially with BGP EVPN-based VXLAN, the control plane is distributed rather than relying on a controller to synchronously deliver flow tables. Devices dynamically learn and exchange forwarding information using EVPN. Even in SDN-based scenarios with iMaster NCE-Fabric, policy delivery is not strictly synchronous flow table pushing in the traditional sense (like OpenFlow).

Therefore, “controller delivers flow tables synchronously” is not a standard capability of Huawei overlay networks, making option D incorrect.

In IPv6, the concept of broadcast addresses does not exist , which is a fundamental difference from IPv4. Instead of broadcast, IPv6 uses multicast and anycast to achieve similar communication functions more efficiently. Therefore, statement B is false , as there is no such thing as an IPv6 broadcast address with all bits set to 1.

Statement A is correct: Unique Local Addresses (ULA) are intended for internal communication within a site or organization and are not routable on the public Internet, similar to IPv4 private addresses.

Statement C is also correct: Global Unicast Addresses in IPv6 are globally routable and function similarly to public IPv4 addresses, enabling end-to-end communication across networks.

Statement D is correct as well: Link-local addresses (FE80::/10) are automatically configured and used only for communication within the same local link (e.g., for neighbor discovery and routing protocols).

Huawei data center designs emphasize IPv6’s efficiency and scalability, particularly its elimination of broadcast traffic, which improves network performance and reduces unnecessary load.

In Huawei CloudFabric Solution, health check and intelligent O & M are performed across multiple key dimensions to ensure stable, secure, and efficient network operations. These dimensions provide a comprehensive view of the data center network’s health.

Capacity (A): Evaluates resource utilization such as bandwidth, device capacity, and scalability limits to prevent bottlenecks.

Status (B): Monitors the operational state of devices, links, and services (up/down, faults, alarms).

Connectivity (D): Verifies end-to-end network reachability, ensuring that services and tenants can communicate properly across the fabric.

Security policy (E): Checks correctness and consistency of policies such as ACLs, segmentation, and service chaining rules.

Performance (F): Measures latency, packet loss, throughput, and congestion, which are critical in modern workloads like AI and storage.

VM (C) is not considered a core health check dimension at the network level. It belongs more to the compute/virtualization domain rather than network O & M.

Huawei iMaster NCE-FabricInsight uses these dimensions to provide proactive fault detection, root cause analysis, and optimization recommendations , ensuring intelligent lifecycle management of the data center network.