According to the Huawei HCIA-Cloud Computing training materials, statement D is FALSE. In the Linux operating system, permissions are determined by the User ID (UID) and the specific privileges of the account logged in (such as the root user), not by the type of interface being used. Whether an administrator uses a Graphical User Interface (GUI) or a Command-Line Interface (CLI), the ability to modify the kernel or change system files is strictly governed by the OS's access control lists and kernel-level security modules. In many enterprise cloud environments, such as those running Huawei's EulerOS, the GUI is often not even installed to reduce the attack surface and save resources.
The other statements are technically correct. Statement A is true because the CLI allows for automation through scripting, making it far superior for routine maintenance and batch processing. Statement B is true because a GUI requires a display server (like X11 or Wayland) and a desktop environment, which significantly increase CPU and memory overhead compared to the text-based CLI. Statement C is true because an experienced administrator can execute complex tasks with a few keystrokes in the CLI much faster than navigating multiple windows and menus in a GUI. In the official curriculum, it is emphasized that for cloud data centers, the CLI is the primary tool for O&M (Operation and Maintenance) because it provides a direct, high-performance link to the system shell. The idea that a GUI provides "higher permissions" is a common misconception; in fact, critical kernel modifications are almost exclusively performed via the CLI or system configuration files to ensure precision and auditability.

In FusionCompute virtual networking, VMs in thesame network segment and same port groupshould be able to communicate normally.
OptionAis a possible cause. Host-based or VM-based firewalls may block traffic between virtual machines.
OptionCis also a possible cause.Security groupscan apply access control rules that isolate VMs, even within the same subnet.
OptionDis a possible cause. Faulty virtual NICs or driver issues can prevent network communication.
OptionBisnota possible cause. If both VM NICs are connected to thesame port group, they should be able to communicate, assuming no other restrictions exist.
Therefore, the correct answer isB.

Device RedirectionAccording to the Huawei HCIA-Cloud Computing training materials, the Huawei Desktop Protocol (HDP) offers two primary methods for handling USB peripherals: USB Port Redirection and USB Device Redirection (often referred to more broadly as high-level "Device Redirection").By default, FusionAccess utilizesUSB Port Redirection. This technology works at the physical layer, capturing the USB Request Blocks (URBs) from the client terminal and transmitting them to the virtual machine. This allows the Guest OS to "see" the raw USB device and use its own local drivers. This is the most compatible method for a wide range of devices such as specialized scanners or unique USB dongles.However, if a device is still unavailable or suffers from performance issues (common on high-latency WAN links), the administrator can configure the"Device Redirection"policy. This method operates at a higher logical level. Instead of redirecting the raw USB signals, it redirects the specific function of the device. For example, a USB flash drive can be redirected using "Client Drive Redirection," or a USB printer can be redirected via "Printer Redirection." This high-level redirection is more efficient as it optimizes the data flow for that specific device class, often providing a smoother user experience in constrained network environments. In the FusionAccess management portal (ITA), these policies are managed under "HDP Policy Management," where administrators can fine- tune which redirection method takes priority based on the specific hardware being used by the end-users.

In the Huawei HCIA-Cloud Computing curriculum, specifically under the "Network Technology Basics" module, Open vSwitch (OVS) is introduced as a key component of software-defined networking (SDN). The primary technology used by OVS for remote access to its control plane and for the programmatic control of traffic flows is OpenFlow.5 OpenFlow is a standard communications protocol that allows an SDN controller (the "brain" of the network) to interact with the forwarding plane (the switch) of a network device.
OpenFlow enables "traffic control" by allowing the controller to define specificflow rules.6These rules tell the switch exactly how to handle packets based on various criteria such as source MAC, destination IP, or TCP port. Instead of the switch making local, autonomous decisions (as a traditional switch does), OVS uses OpenFlow to receive instructions from a centralized management layer. This is how Huawei's cloud infrastructure achieves "remote access" for network orchestration; an administrator can change the network behavior of thousands of virtual machines across multiple physical hosts by pushing new OpenFlow tables from a central controller.
WhileOVSDB(Option B) is also a critical protocol for OVS, its primary role is to manage theconfigurationof the switch (such as creating bridges, adding ports, or setting up tunnels), rather than the "traffic control" or
"flow steering" handled by OpenFlow.BFD(Option C) is used for link failure detection, andNQA(Option D) is a Huawei-specific tool for measuring network performance. In the context of the HCIA exam, OpenFlow is the correct answer for the protocol that enables the intelligent, remote management of data paths in a virtualized network environment.

Explanation:
Scenario
Operation
User data is stored in a network directory instead of a local host.
Folder redirection
The client IP address segment is not configured. Users can access VMs from any IP address segment.
Access control policy
A parallel-to-USB cable can be used to connect the parallel port device to the client.
Peripheral policy creation
In FusionAccess, policy management allows for deep customization of the user environment.Folder redirectionis a key feature for maintaining data persistence and centralized backup. It ensures thatuser data is stored in a network directoryrather than locally on the virtual machine's disk. This prevents data loss if a VM is refreshed or deleted, which is common in linked-clone pool environments.
Access control policiesare used to define the security boundaries of the VDI environment. When theclient IP address segment is not configured, it defaults to a permissive state whereusers can access VMs from any IP segment. Administrators typically use this policy to restrict access to known corporate subnets or specific VPN ranges to enhance overall security.Peripheral policy creationprovides support for legacy hardware or specialized equipment. By configuring these policies, aparallel-to-USB cable can be usedto bridge legacy parallel port devices to the modern USB ports of the client terminal, ensuring business continuity for specialized printing or diagnostic hardware.