The dual-plane isolation networking scheme in Huawei FusionInsight HD is a fundamental architecture designed to separate different types of network traffic, typically management traffic and service traffic, onto physically distinct networks. This separation is crucial for security, performance, and reliability. To implement this physical isolation, each node in the cluster must be equipped with at least two physical Network Interface Cards (NICs). One NIC is dedicated to the management plane, and the other is dedicated to the service plane. A single NIC cannot provide the required physical separation, thus making the statement false.

A. True: This is incorrect. A single physical NIC represents a single point of failure and cannot achieve the physical network isolation that is the primary purpose of a dual-plane networking scheme in an enterprise-grade system like FusionInsight HD.

1. Huawei FusionInsight HD 6.5.1 Product Documentation - Network Planning: In the section describing network plane design, it is explicitly stated that for physical network isolation schemes (such as dual-plane networking), nodes must be configured with multiple NICs. The documentation details that in a typical dual-plane scenario, one NIC connects to the management plane switch, and another NIC connects to the service plane switch. This requirement for at least two physical NICs is a prerequisite for the architecture.

2. Huawei FusionInsight HD Administrator Guide: The guide's section on network configuration and management outlines the different network planes (management, service, floating IP). It implicitly supports the need for multiple physical interfaces to map these logical planes to physically isolated hardware for achieving the recommended high-availability and security postures. The configuration examples for dual-plane networking consistently show mappings to separate physical interfaces (e.g., eth0 for management, eth1 for service).