In the official Huawei FusionAccess maintenance and troubleshooting documentation, High Availability (HA) between the vAG (Virtual Access Gateway) and vLB (Virtual Load Balancer) is maintained through backend synchronization and heartbeat checks. The correct answer is D because changing the ITA portal login password has no technical impact on the background communication between infrastructure VMs. The ITA portal password is the credential used by an administrator to log into the web management interface (https://ITA_IP:8448); it is an application-layer credential stored in the database, not a system-level credential used for inter-component service discovery or HA heartbeats.
In contrast, options A, B, and C can indeed lead to "HA status abnormal." In the Huawei ecosystem, components often communicate using internal system accounts. Specifically, thegandalfaccount is the default account used for the FusionAccess management plane to log in to and manage these components. If an administrator manually changes the gandalf password on the vAG/vLB VM (Option C) without updating the corresponding credentials in the management system, the ITA will lose its ability to query the status of those nodes, resulting in an abnormal HA state.
Furthermore, while the root password (Options A and B) is generally for administrative access, the FusionAccess components are tightly integrated. Changing system-level passwords without using the official Huawei password management tools or updating the service configurations can break the scripts responsible for status reporting and synchronization. Therefore, for the HCIA exam, it is critical to understand that theITA Portal passwordis purely for the user interface and does not affect the technical "plumbing" or HA heartbeats of the underlying virtual appliances.

According to the "Network Technology Basics" chapter of the Huawei HCIA-Cloud Computing training materials, the statement provided is FALSE. The fundamental rule for IPv4 subnet masks is that binary 1s represent the network portion (network ID), while binary 0s represent the host portion (host ID). A subnet mask is a 32-bit value that is used in conjunction with an IP address to determine which segment of the address identifies the network and which segment identifies the specific device or host on that network.
This identification process is performed using a bitwise AND operation. When a computer or router compares an IP address to its subnet mask, the bits that align with the "1s" in the mask are preserved to reveal the network address, while the bits that align with the "0s" are ignored for routing purposes but used to identify the individual host. For example, in a standard Class C subnet mask (255.255.255.0), the first 24 bits are all set to 1. This indicates that the first three octets of the IP address are the network prefix. The remaining 8 bits are set to 0, providing a range for up to 254 usable host addresses.
Understanding this distinction is critical for cloud administrators when planning Virtual Private Clouds (VPC) and subnets within Huawei's cloud infrastructure. If the roles of 1s and 0s were reversed, as suggested in the question, the logic of IP routing and address allocation would fail. The official curriculum emphasizes that the subnet mask must consist of a contiguous block of 1s followed by a block of 0s. The length of the 1s (the prefix length) directly dictates how many subnets can be created and how many hosts each subnet can accommodate.

As detailed in the Huawei FusionAccess documentation for the HCIA curriculum, the Huawei Desktop Protocol (HDP) is designed to optimize the user experience in Virtual Desktop Infrastructure (VDI).
Statement A is correct: HDP features "Intelligent identification of video data."8 The protocol can automatically distinguish between standard GDI (Graphics Device Interface) desktop elements and active video streams.9 When video is detected, HDP switches to specialized compression algorithms (such as H.264 or H.265) to ensure efficient encoding and reduced bandwidth consumption.
Statement B is also a verified function. HDP employsDynamic Frame Rate Adjustment.10By monitoring the network quality (latency and packet loss) in real-time, the protocol can adjust the frame rate (e.g., from 60fps down to 30fps or lower) to maintain a smooth, jitter-free playback experience even on unstable or low- bandwidth links. Statement C is true as HDP supports multiple rendering modes. In "Multimedia Redirection," the video stream is decoded on theclientside (using local hardware acceleration), while in other modes, decoding occurs on theserver(VM) with the resulting images sent to the client. This dual-support flexibility ensures compatibility across various terminal types.
Statement D isincorrectbecause of the "maximum of 2K videos" limitation. According to the official HCIA- Cloud Computing V5.5 and FusionAccess technical guides, HDP@Media technology (multimedia redirection) explicitly supports4K UHDvideo playback, not just a maximum of 2K. While D correctly mentions "automatic reconnection" and "dynamic traffic adjustment," the resolution limit is technically outdated for the current Huawei cloud ecosystem. Thus, for the purposes of the HCIA certification, only A, B, and C are fully accurate representations of HDP's high-fidelity audiovisual capabilities.

FusionCompute supportsmemory overcommitmentto improve overall memory utilization in virtualized environments. The supported technologies include:
* Memory sharing
* Memory ballooning
* Memory swapping
According to HCIA-Cloud Computing materials, after enabling memory overcommitment incluster resource control, administrators mustselect at least one memory overcommitment mechanismto take effect.
Therefore, the statement correctly describes FusionCompute behavior and isTRUE.

FusionAccess defines clear behaviors for desktop service adjustment:
* Bis true. After reassignment, the systemautomatically starts the desktop, and a short wait time is required before user login.
* Dis true. When a desktop assigned to a single user is unassigned, the systemautomatically shuts it downto save resources.
* Ais false. Desktops assigned to multiple users or desktop groupscan be reassignedafter being unassigned.
* Cis false. After unassignment, a desktop can beassigned to a different user, not only the original one.
Thus, the correct answers areB and D.