Practice Free H20-923_V1.0 Exam Online Questions
Question #1
Which of the following are main components of Huawei indirect evaporative cooling system?
- A . Compressor
- B . Air filter
- C . Water pump
- D . Spray system
- E . Heat exchanger
- F . Fan
Correct Answer: B, C, D, E, F
B, C, D, E, F
Explanation:
Huawei’s indirect evaporative cooling system is designed to use the outdoor air as a “free” cold source while keeping the data hall supply air isolated from outdoor contaminants and moisture. Its core is the heat exchanger, where heat from the indoor (return) air side is transferred to the outdoor working air side without mixing the two air streams. To enhance heat removal on the outdoor side, a spray system wets the evaporation media or spray section, and a water pump circulates water to maintain uniform wetting and stable evaporation performance. Fans drive airflow through the indoor and outdoor paths to ensure sufficient heat transfer and maintain the required air volume and pressure. Because outdoor air is involved on the working-air side, air filters are required to reduce dust and protect the heat exchanger and internal airflow channels, improving reliability and reducing maintenance. A compressor is not a main component of indirect evaporative cooling because the system primarily relies on evaporation and heat exchange rather than mechanical refrigeration.
B, C, D, E, F
Explanation:
Huawei’s indirect evaporative cooling system is designed to use the outdoor air as a “free” cold source while keeping the data hall supply air isolated from outdoor contaminants and moisture. Its core is the heat exchanger, where heat from the indoor (return) air side is transferred to the outdoor working air side without mixing the two air streams. To enhance heat removal on the outdoor side, a spray system wets the evaporation media or spray section, and a water pump circulates water to maintain uniform wetting and stable evaporation performance. Fans drive airflow through the indoor and outdoor paths to ensure sufficient heat transfer and maintain the required air volume and pressure. Because outdoor air is involved on the working-air side, air filters are required to reduce dust and protect the heat exchanger and internal airflow channels, improving reliability and reducing maintenance. A compressor is not a main component of indirect evaporative cooling because the system primarily relies on evaporation and heat exchange rather than mechanical refrigeration.
Question #2
Through device management, you can view the information about
- A . Overview
- B . Alarm
- C . Signal
- D . Service period
Correct Answer: A, B, C, D
A, B, C, D
Explanation:
In Huawei smart module management (such as on the ECC800-Pro/WebUI), Device Management is used to centrally view and maintain managed objects (UPS, SmartLi, rPDU, sensors, air conditioners, etc.). The Overview page provides a consolidated snapshot of a device’s operating status, key parameters, running mode, and basic identification information so engineers can quickly judge whether the device is healthy and online. The Alarm view lists active and historical alarms related to the device, supporting rapid fault isolation and verification after recovery. The Signal view shows monitoring points and I/O status (including analog values and digital inputs/outputs where applicable), which helps engineers confirm sensor wiring, linkage logic, and real-time state changes during commissioning and troubleshooting. The Service period information is used for lifecycle and maintenance planning, such as tracking service time, maintenance intervals, or component life indicators where supported, enabling preventive maintenance and reducing unexpected downtime. Therefore, Device Management supports viewing all four categories.
A, B, C, D
Explanation:
In Huawei smart module management (such as on the ECC800-Pro/WebUI), Device Management is used to centrally view and maintain managed objects (UPS, SmartLi, rPDU, sensors, air conditioners, etc.). The Overview page provides a consolidated snapshot of a device’s operating status, key parameters, running mode, and basic identification information so engineers can quickly judge whether the device is healthy and online. The Alarm view lists active and historical alarms related to the device, supporting rapid fault isolation and verification after recovery. The Signal view shows monitoring points and I/O status (including analog values and digital inputs/outputs where applicable), which helps engineers confirm sensor wiring, linkage logic, and real-time state changes during commissioning and troubleshooting. The Service period information is used for lifecycle and maintenance planning, such as tracking service time, maintenance intervals, or component life indicators where supported, enabling preventive maintenance and reducing unexpected downtime. Therefore, Device Management supports viewing all four categories.
Question #3
The rated output capability of a single power module for the UPS5000-H is how many kVA.
- A . 50
- B . 100
- C . 30
- D . 60
Correct Answer: B
B
Explanation:
Huawei UPS5000-H is a modular UPS platform built by paralleling standardized power modules inside the power cabinet to form different system capacities. In this architecture, the “single power module” is the basic building block that contributes a fixed rated apparent power to the total UPS capacity. For the UPS5000-H series, each power module is rated at 100 kVA, and the system capacity is achieved by installing multiple 100 kVA modules and configuring redundancy (such as N+1). This modular approach improves availability and O&M efficiency because a failed module can be isolated and replaced without shutting down the entire UPS, while the remaining modules continue carrying the load within their capacity limits. Using 100 kVA as the module rating also simplifies planning: technicians can quickly estimate remaining headroom by counting active modules and comparing total available kVA/kW against the real-time load, ensuring the UPS stays within recommended loading and redundancy margins during maintenance or fault conditions.
B
Explanation:
Huawei UPS5000-H is a modular UPS platform built by paralleling standardized power modules inside the power cabinet to form different system capacities. In this architecture, the “single power module” is the basic building block that contributes a fixed rated apparent power to the total UPS capacity. For the UPS5000-H series, each power module is rated at 100 kVA, and the system capacity is achieved by installing multiple 100 kVA modules and configuring redundancy (such as N+1). This modular approach improves availability and O&M efficiency because a failed module can be isolated and replaced without shutting down the entire UPS, while the remaining modules continue carrying the load within their capacity limits. Using 100 kVA as the module rating also simplifies planning: technicians can quickly estimate remaining headroom by counting active modules and comparing total available kVA/kW against the real-time load, ensuring the UPS stays within recommended loading and redundancy margins during maintenance or fault conditions.
Question #4
In alarm management, the status can be identified by masking rules.
- A . Invalid
- B . Standard
- C . Maintenance
- D . Valid
Correct Answer: A, C
A, C
Explanation:
In Huawei alarm management, masking rules are used to control how alarms are handled and displayed during specific conditions, such as planned maintenance, commissioning, device replacement, or known temporary abnormalities. When a masking rule is applied, the system can change how an alarm is classified so that O&M staff can distinguish between alarms that require immediate action and alarms that are expected or should be excluded from operational statistics. Two key statuses that masking rules can assign are Maintenance and Invalid. Maintenance indicates the alarm is generated during an approved maintenance activity (for example, power-off tests, sensor rewiring, cooling maintenance), so it is treated as expected and does not trigger normal escalation logic. Invalid indicates the alarm is not considered effective for operational follow-up― commonly used when a point is confirmed to be non-applicable, temporarily disabled, or its triggering condition is not meaningful to current operations. By contrast, Valid and Standard represent normal alarm handling states rather than outcomes specifically “identified by masking rules.”
A, C
Explanation:
In Huawei alarm management, masking rules are used to control how alarms are handled and displayed during specific conditions, such as planned maintenance, commissioning, device replacement, or known temporary abnormalities. When a masking rule is applied, the system can change how an alarm is classified so that O&M staff can distinguish between alarms that require immediate action and alarms that are expected or should be excluded from operational statistics. Two key statuses that masking rules can assign are Maintenance and Invalid. Maintenance indicates the alarm is generated during an approved maintenance activity (for example, power-off tests, sensor rewiring, cooling maintenance), so it is treated as expected and does not trigger normal escalation logic. Invalid indicates the alarm is not considered effective for operational follow-up― commonly used when a point is confirmed to be non-applicable, temporarily disabled, or its triggering condition is not meaningful to current operations. By contrast, Valid and Standard represent normal alarm handling states rather than outcomes specifically “identified by masking rules.”
Question #5
Which of the following is not a scenario-based solution for Huawei data center products?
- A . FusionDC800
- B . FusionDC1000
- C . FusionModule500
- D . FusionModule2000
Correct Answer: A
A
Explanation:
Huawei’s scenario-based data center facility portfolio is organized around clearly defined solution families that map to typical deployment scenarios and site sizes. FusionModule500 and FusionModule2000 are smart modular data center solutions designed for standardized, fast deployment in equipment rooms and enterprise edge/branch scenarios. They integrate key subsystems such as power supply and distribution, cooling, monitoring, and optional fire protection into a modular architecture that reduces footprint and accelerates on-site delivery. Likewise, FusionDC1000 is Huawei’s prefabricated modular data center series, delivered as complete, factory-integrated modules that combine civil engineering elements with electromechanical infrastructure for rapid construction, predictable quality, and scalable expansion across different capacity tiers. In contrast, FusionDC800 is not used as a defined scenario-based solution name within Huawei’s mainstream data center facility solution lineup (where “FusionDC” offerings are represented by the FusionDC1000 series and “FusionModule” offerings by numbered FusionModule solutions). Therefore, FusionDC800 is the option that does not match Huawei’s scenario-based solution naming.
A
Explanation:
Huawei’s scenario-based data center facility portfolio is organized around clearly defined solution families that map to typical deployment scenarios and site sizes. FusionModule500 and FusionModule2000 are smart modular data center solutions designed for standardized, fast deployment in equipment rooms and enterprise edge/branch scenarios. They integrate key subsystems such as power supply and distribution, cooling, monitoring, and optional fire protection into a modular architecture that reduces footprint and accelerates on-site delivery. Likewise, FusionDC1000 is Huawei’s prefabricated modular data center series, delivered as complete, factory-integrated modules that combine civil engineering elements with electromechanical infrastructure for rapid construction, predictable quality, and scalable expansion across different capacity tiers. In contrast, FusionDC800 is not used as a defined scenario-based solution name within Huawei’s mainstream data center facility solution lineup (where “FusionDC” offerings are represented by the FusionDC1000 series and “FusionModule” offerings by numbered FusionModule solutions). Therefore, FusionDC800 is the option that does not match Huawei’s scenario-based solution naming.
Question #6
The software installation package does not need to be downloaded for the preinstalled server.
- A . True
- B . False
Correct Answer: A
A
Explanation:
In Huawei delivery scenarios, a preinstalled server means the target software (for example, the NetEco platform and its required runtime components) has already been deployed and integrated on the server image before it is handed over for on-site commissioning. Because the installation media has already been applied, the on-site engineer’s work typically shifts from “software installation” to “environment verification and initialization,” such as confirming OS/service status, checking resource allocation, validating database and middleware health, verifying network planning (IP, gateway, DNS/NTP as required), and completing application-level initialization (site creation, user/role configuration, northbound interface settings, and device/model import if needed). In this case, downloading the full installation package is not a mandatory step for commissioning, because the package is mainly required when performing a fresh installation or reinstall/upgrade. However, standard practice is still to prepare supporting materials (patches, licenses, and compatibility documents) and ensure the preinstalled version matches the project baseline before acceptance.
A
Explanation:
In Huawei delivery scenarios, a preinstalled server means the target software (for example, the NetEco platform and its required runtime components) has already been deployed and integrated on the server image before it is handed over for on-site commissioning. Because the installation media has already been applied, the on-site engineer’s work typically shifts from “software installation” to “environment verification and initialization,” such as confirming OS/service status, checking resource allocation, validating database and middleware health, verifying network planning (IP, gateway, DNS/NTP as required), and completing application-level initialization (site creation, user/role configuration, northbound interface settings, and device/model import if needed). In this case, downloading the full installation package is not a mandatory step for commissioning, because the package is mainly required when performing a fresh installation or reinstall/upgrade. However, standard practice is still to prepare supporting materials (patches, licenses, and compatibility documents) and ensure the preinstalled version matches the project baseline before acceptance.
Question #7
If the SPD indicator of a smart module is green, the SPD is running properly. If the SPD indicator is red, the SPD is faulty and must be replaced immediately.
- A . True
- B . False
Correct Answer: A
A
Explanation:
In Huawei data center power distribution design, the SPD (Surge Protective Device) provides overvoltage surge protection for sensitive loads by diverting transient energy to ground through internal protection components. The SPD status indicator is used for O&M judgment of protection availability. When the indicator is green, it indicates the SPD protection components are within normal working condition and the surge protection path remains effective. When the indicator turns red, it typically means the SPD’s internal protection element has degraded or disconnected (end-of-life or failure after cumulative surges), and the device can no longer provide the rated protection level. In this condition, the distribution system is left exposed to surge risk, especially during thunderstorms, switching operations, or upstream disturbances. Therefore, Huawei O&M practice treats a red SPD indicator as a replacement trigger, requiring immediate corrective action: confirm alarm/status, ensure safe isolation following electrical safety procedures, and replace the SPD module to restore protection and maintain power system reliability.
A
Explanation:
In Huawei data center power distribution design, the SPD (Surge Protective Device) provides overvoltage surge protection for sensitive loads by diverting transient energy to ground through internal protection components. The SPD status indicator is used for O&M judgment of protection availability. When the indicator is green, it indicates the SPD protection components are within normal working condition and the surge protection path remains effective. When the indicator turns red, it typically means the SPD’s internal protection element has degraded or disconnected (end-of-life or failure after cumulative surges), and the device can no longer provide the rated protection level. In this condition, the distribution system is left exposed to surge risk, especially during thunderstorms, switching operations, or upstream disturbances. Therefore, Huawei O&M practice treats a red SPD indicator as a replacement trigger, requiring immediate corrective action: confirm alarm/status, ensure safe isolation following electrical safety procedures, and replace the SPD module to restore protection and maintain power system reliability.
Question #8
Which strategy most directly improves data center energy performance without compromising reliability when properly engineered and monitored?
- A . Oversize all cooling and power equipment permanently to avoid future upgrades
- B . Use higher allowable supply air temperature with containment and adaptive control to reduce compressor and fan energy
- C . Disable alarms to reduce nuisance notifications and operator workload
- D . Operate all redundant systems at full load simultaneously to maximize utilization
Correct Answer: B
B
Explanation:
Huawei green data center concepts focus on reducing energy consumption through engineering controls rather than sacrificing resilience. Raising the allowable supply air temperature is a proven efficiency lever because it reduces compressor workload, expands economization opportunities where applicable, and can reduce fan energy when airflow is optimized. However, it must be implemented with airflow management―especially hot/cold aisle containment―to ensure server inlet temperatures remain within safe limits. Adaptive control is critical: monitoring rack inlet temperatures, cooling unit performance, and environmental conditions allows the system to dynamically adjust cooling output, fan speed, and setpoints to match real IT load. This avoids the common inefficiency of “overcooling for safety.” When combined with standardized O&M procedures, alarm thresholds, and continuous trend analysis, the strategy improves overall energy performance while preserving reliability and service continuity. In contrast, permanent oversizing or forcing all redundant systems to run fully loaded wastes energy and can reduce operating efficiency. Properly engineered, monitored optimization delivers efficiency gains with controlled operational risk.
B
Explanation:
Huawei green data center concepts focus on reducing energy consumption through engineering controls rather than sacrificing resilience. Raising the allowable supply air temperature is a proven efficiency lever because it reduces compressor workload, expands economization opportunities where applicable, and can reduce fan energy when airflow is optimized. However, it must be implemented with airflow management―especially hot/cold aisle containment―to ensure server inlet temperatures remain within safe limits. Adaptive control is critical: monitoring rack inlet temperatures, cooling unit performance, and environmental conditions allows the system to dynamically adjust cooling output, fan speed, and setpoints to match real IT load. This avoids the common inefficiency of “overcooling for safety.” When combined with standardized O&M procedures, alarm thresholds, and continuous trend analysis, the strategy improves overall energy performance while preserving reliability and service continuity. In contrast, permanent oversizing or forcing all redundant systems to run fully loaded wastes energy and can reduce operating efficiency. Properly engineered, monitored optimization delivers efficiency gains with controlled operational risk.
Question #9
Which of the following statements are true?
- A . When the UPS works in normal mode, you can directly turn on the maintenance bypass switch.
- B . When the UPS works in static bypass mode, if the mains input outage occurs suddenly, the UPS automatically switches to battery mode.
- C . Huawei UPS5000-H is a modular UPS. If a module fails, it can be replaced online.
- D . When mains and bypass input of the UPSs share one power source, if mains outage occurs, the UPS cannot work in bypass mode.
Correct Answer: B, C, D
B, C, D
Explanation:
In Huawei UPS operating logic and standard data center O&M practice, the maintenance bypass is a mechanical path used to isolate the UPS for service. In normal mode the load is carried by the inverter, so you should not directly close the maintenance bypass without a controlled transfer procedure; doing so can create an unsafe parallel path or impact synchronization, therefore statement A is false. In static bypass mode, the load is supplied through the bypass path; if the bypass/mains source fails, the UPS can perform an automatic transfer from bypass to inverter, and the inverter will be supported by the battery through the DC link, so B is true under the expected functional behavior. UPS5000-H is designed as a modular UPS, supporting online (hot) replacement of power modules to restore capacity without shutting down the entire system, so C is true. If the rectifier mains input and bypass input share the same source, a mains outage removes the bypass source as well, meaning bypass operation is not available, so D is true.
B, C, D
Explanation:
In Huawei UPS operating logic and standard data center O&M practice, the maintenance bypass is a mechanical path used to isolate the UPS for service. In normal mode the load is carried by the inverter, so you should not directly close the maintenance bypass without a controlled transfer procedure; doing so can create an unsafe parallel path or impact synchronization, therefore statement A is false. In static bypass mode, the load is supplied through the bypass path; if the bypass/mains source fails, the UPS can perform an automatic transfer from bypass to inverter, and the inverter will be supported by the battery through the DC link, so B is true under the expected functional behavior. UPS5000-H is designed as a modular UPS, supporting online (hot) replacement of power modules to restore capacity without shutting down the entire system, so C is true. If the rectifier mains input and bypass input share the same source, a mains outage removes the bypass source as well, meaning bypass operation is not available, so D is true.
Question #10
In a data center fire protection design, which approach best matches Huawei facility practice for protecting IT rooms while minimizing secondary damage to IT equipment?
- A . Use only portable extinguishers and rely on manual response
- B . Deploy a smoke detection system plus a clean-agent gas extinguishing system with interlock controls for automatic release
- C . Install a water sprinkler system as the only suppression method inside the IT white space
- D . Disable automatic suppression to avoid accidental discharge
Correct Answer: B
B
Explanation:
Huawei data center facility design typically follows a layered fire protection concept: early detection, controlled alarm linkage, and suppression methods that protect equipment and ensure personnel safety. A smoke detection system (often combined with staged alarms) provides early warning so operators can verify events and initiate emergency procedures. For the IT white space, a clean-agent gas extinguishing system is preferred because it suppresses fire without leaving residue and significantly reduces the risk of corrosion or contamination compared with powder-based agents. The extinguishing system is normally integrated with linkage/interlock controls: audible/visual pre-discharge alarms, time delay, emergency abort, door access control logic, and HVAC shutdown or damper control to help maintain agent concentration. This coordinated mechanism reduces false discharge risk while preserving a reliable automatic response if a real fire develops. In contrast, relying only on manual extinguishers is too slow for rapid fire growth, and water sprinklers alone can cause substantial collateral damage to servers and power equipment.
B
Explanation:
Huawei data center facility design typically follows a layered fire protection concept: early detection, controlled alarm linkage, and suppression methods that protect equipment and ensure personnel safety. A smoke detection system (often combined with staged alarms) provides early warning so operators can verify events and initiate emergency procedures. For the IT white space, a clean-agent gas extinguishing system is preferred because it suppresses fire without leaving residue and significantly reduces the risk of corrosion or contamination compared with powder-based agents. The extinguishing system is normally integrated with linkage/interlock controls: audible/visual pre-discharge alarms, time delay, emergency abort, door access control logic, and HVAC shutdown or damper control to help maintain agent concentration. This coordinated mechanism reduces false discharge risk while preserving a reliable automatic response if a real fire develops. In contrast, relying only on manual extinguishers is too slow for rapid fire growth, and water sprinklers alone can cause substantial collateral damage to servers and power equipment.
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