H12-893_V1.0 Exam Questions Tutorials

Huawei’s iMaster NCE-Fabric is an SDN controller for the CloudFabric data center network solution, providing network management and automation. The rollback feature allows administrators to revert configuration changes to previous states in case of errors. According to Huawei’s documentation, iMaster NCE-Fabric supportsfour rollback levels, enabling the system to store and restore up to four previous configuration versions. This ensures flexibility in undoing changes during network management tasks like upgrades or policy adjustments.

Options Analysis:

A. 3: Incorrect, as it underestimates the supported levels.

B. 4: Correct, aligning with Huawei’s specified rollback capability.

C. 2: Incorrect, as it is fewer than the supported levels.

D. 1: Incorrect, as it limits rollback to a single state, which is insufficient for complex management.

Thus, the answer isB (4).References:Huawei CloudFabric Data Center Network Solution – iMaster NCE-Fabric Features; HCIP-Data Center Network Training – SDN Controller Management.

Reliability in Huawei’s CloudFabric data centers is enhanced through various mechanisms. Let’s evaluate each option:

A. Power supply redundancy:This is true. Redundant power supplies (e.g., dual PSUs) ensure uninterrupted operation during power failures, a key reliability feature.TRUE.

B. M-LAG (Multi-Chassis Link Aggregation):This is true. M-LAG provides high availability by allowing active-active forwarding and failover between switches, enhancing network reliability.TRUE.

C. Monitor Link:This is false. Monitor Link is a Huawei feature for link status monitoring, not a direct reliability enhancement mechanism like redundancy or clustering.FALSE.

D. Controller cluster:This is true. A clustered SDN controller (e.g., iMaster NCE-Fabric) ensures high availability and failover, improving network management reliability.TRUE.

Thus,A, B, and Denhance DC reliability.References:Huawei CloudFabric Data Center Network Solution – Reliability Features; HCIP-Data Center Network Training – High Availability.

Traditional data center networks (DCNs) often suffer from single points of failure, limited scalability, and traffic bottlenecks. Both M-LAG and stacking address these issues, but their suitability for 24/7 service continuity differs.

M-LAG Benefits:M-LAG (Multi-Chassis Link Aggregation) on Huawei CE switches allows two devices to act as a single logical switch, providing active-active forwarding, high availability, and rapid failover (e.g., via peer-link synchronization). It supports non-stop service during device failures, making it ideal for 24/7 continuity.

Stacking Benefits:Stacking combines multiple switches into a single logical unit, sharing a control plane. While it improves scalability and simplifies management, a stack master failure can disrupt the entire stack unless redundancy is perfectly configured, potentially affecting service continuity.

Comparison:M-LAG’s decentralized design and real-time synchronization offer better fault isolation and recovery compared to stacking, where a master switch failure impacts the stack. Huawei documentation highlights M-LAG’s superiority for high-availability scenarios like 24/7 operations.

The statement isTRUE (A)because M-LAG is indeed a better choice than stacking for ensuring 24/7 service continuity due to its robust failover and redundancy features.References:Huawei CloudEngine Series Switch Configuration Guide – M-LAG vs. Stacking; HCIP-Data Center Network Training – High Availability Solutions.

A hypervisor is a software layer that creates and manages virtual machines (VMs) by abstracting physical resources from the underlying hardware. The question specifies that the hypervisor virtualizes "memory" and "input/output (I/O) resources," and the task is to provide the missing resource acronym in uppercase letters. In virtualization contexts, including Huawei’s FusionCompute or OpenStack with KVM, the primary physical resources virtualized by a hypervisor are:

CPU:The central processing unit (CPU) is virtualized to allocate processing power to VMs, enabling multi-tenancy and workload isolation.

Memory:Virtualized to provide RAM allocation to VMs, abstracted via memory management units (MMUs).

I/O Resources:Input/output resources (e.g., NICs, disks) are virtualized to allow VMs to communicate and store data, often through virtual NICs (vNICs) or virtual disks.

The question lists "memory" and "I/O resources" explicitly, implying the missing resource is CPU, as it completes the standard triad of virtualized resources in hypervisor design. Thus, the answer isCPU.References:Huawei HCIP-Data Center Network Training – Virtualization Fundamentals; FusionCompute Architecture Guide.