Practice Free H20-923_V1.0 Exam Online Questions
Question #11
During wizard startup, when you enter the screen for selecting commissioning items for the first time, all items are selected by default.
Which item is mandatory. You can deselect other commissioning items that are not mandatory.
- A . Commissioning the indoor fans
- B . Commissioning the condensate pump
- C . Commissioning the humidifier
- D . Commissioning the cooling system
Correct Answer: D
D
Explanation:
In Huawei precision cooling commissioning, the wizard groups functional commissioning items so technicians can validate key subsystems efficiently. The cooling system commissioning is mandatory because it verifies the primary control and protection loop that directly determines whether the unit can safely provide cooling capacity. This includes confirming the refrigeration or chilled-water cooling path can start and stop correctly, sensors and control logic are valid, and protection conditions (such as abnormal pressures/temperatures, flow conditions, or interlocks) behave as expected. Without completing cooling-system commissioning, the unit’s core purpose―stable temperature control for IT loads―cannot be assured, and the controller cannot reliably judge normal versus fault states during operation.
Other items (indoor fans, condensate pump, humidifier) are important but scenario-dependent: some sites do not use humidification, some drainage designs do not require an internal condensate pump, and fan checks can be handled as part of broader functional tests or may vary by redundancy configuration. Therefore, the wizard allows non-mandatory items to be deselected, but the cooling system commissioning must remain selected to complete a valid baseline commissioning workflow.
D
Explanation:
In Huawei precision cooling commissioning, the wizard groups functional commissioning items so technicians can validate key subsystems efficiently. The cooling system commissioning is mandatory because it verifies the primary control and protection loop that directly determines whether the unit can safely provide cooling capacity. This includes confirming the refrigeration or chilled-water cooling path can start and stop correctly, sensors and control logic are valid, and protection conditions (such as abnormal pressures/temperatures, flow conditions, or interlocks) behave as expected. Without completing cooling-system commissioning, the unit’s core purpose―stable temperature control for IT loads―cannot be assured, and the controller cannot reliably judge normal versus fault states during operation.
Other items (indoor fans, condensate pump, humidifier) are important but scenario-dependent: some sites do not use humidification, some drainage designs do not require an internal condensate pump, and fan checks can be handled as part of broader functional tests or may vary by redundancy configuration. Therefore, the wizard allows non-mandatory items to be deselected, but the cooling system commissioning must remain selected to complete a valid baseline commissioning workflow.
Question #12
The NetEco northbound interface does not support the SNMP protocol. Only WebService interfaces are supported.
- A . True
- B . False
Correct Answer: B
B
Explanation:
In Huawei’s data center facility management architecture, the northbound interface of NetEco is designed specifically to integrate with upper-layer systems such as enterprise NMS platforms, SOC/monitoring centers, and customer unified O&M systems. To meet common industry integration practices, NetEco northbound capabilities are not limited to only one interface type. In addition to WebService-style interfaces used for richer data exchange and structured integration, NetEco also supports SNMP-based northbound integration, which is widely used for alarm forwarding, basic status monitoring, and interoperability with standard network management tools. SNMP is particularly common in mixed-vendor environments because it enables a lightweight and standardized method to deliver key alarms and events to a customer’s central monitoring platform without requiring deep application coupling. Therefore, the statement that “only WebService interfaces are supported and SNMP is not supported” is incorrect: NetEco northbound integration supports SNMP along with other northbound interface methods depending on the integration scenario and customer requirements.
B
Explanation:
In Huawei’s data center facility management architecture, the northbound interface of NetEco is designed specifically to integrate with upper-layer systems such as enterprise NMS platforms, SOC/monitoring centers, and customer unified O&M systems. To meet common industry integration practices, NetEco northbound capabilities are not limited to only one interface type. In addition to WebService-style interfaces used for richer data exchange and structured integration, NetEco also supports SNMP-based northbound integration, which is widely used for alarm forwarding, basic status monitoring, and interoperability with standard network management tools. SNMP is particularly common in mixed-vendor environments because it enables a lightweight and standardized method to deliver key alarms and events to a customer’s central monitoring platform without requiring deep application coupling. Therefore, the statement that “only WebService interfaces are supported and SNMP is not supported” is incorrect: NetEco northbound integration supports SNMP along with other northbound interface methods depending on the integration scenario and customer requirements.
Question #13
What is the upstream input voltage range of the UPS5000-H?
- A . 360 VC600 V
- B . 220 VC240 V
- C . 380 VC415 V
- D . 138 VC485 V
Correct Answer: D
D
Explanation:
For the Huawei UPS5000-H (380/400/415 V class), “upstream input voltage range” refers to the acceptable AC mains (rectifier) line-to-line input voltage window that the UPS can tolerate while maintaining operation. Huawei specifies a wide mains input voltage range of 138C485 Vac (line voltage) to improve adaptability to weak or fluctuating power grids and to reduce unnecessary battery usage when the utility voltage sags or rises within allowable limits. Within this overall window, the UPS may apply derating rules at lower voltages (for example, full-load operation is typically guaranteed only above a higher threshold), but the upstream input can still remain connected and the UPS continues supplying the load according to its control strategy and available capacity. The other options do not match the upstream AC input range: 360C600 V is commonly associated with battery DC voltage ranges, 220C240 V is single-phase class, and 380C415 V represents rated voltage, not the full acceptable upstream range.
D
Explanation:
For the Huawei UPS5000-H (380/400/415 V class), “upstream input voltage range” refers to the acceptable AC mains (rectifier) line-to-line input voltage window that the UPS can tolerate while maintaining operation. Huawei specifies a wide mains input voltage range of 138C485 Vac (line voltage) to improve adaptability to weak or fluctuating power grids and to reduce unnecessary battery usage when the utility voltage sags or rises within allowable limits. Within this overall window, the UPS may apply derating rules at lower voltages (for example, full-load operation is typically guaranteed only above a higher threshold), but the upstream input can still remain connected and the UPS continues supplying the load according to its control strategy and available capacity. The other options do not match the upstream AC input range: 360C600 V is commonly associated with battery DC voltage ranges, 220C240 V is single-phase class, and 380C415 V represents rated voltage, not the full acceptable upstream range.
Question #14
For hourly statistics reports, data of up to how many days can be queried? For monthly statistics reports, data of up to how many years can be queried?
- A . 5
- B . 10
- C . 20
- D . 30
Correct Answer: A
A
Explanation:
In Huawei NetEco statistical reporting, the query range is constrained by the report data retention policy and how summary data is stored. For hourly statistics, the platform keeps a limited window of high-granularity data to balance storage consumption and performance. The hourly report retention is 120 hours, which equals 5 days. That is why hourly statistics queries are limited to 5 days―beyond that window, hourly granularity is no longer retained in the report database for direct querying. For longer time horizons, NetEco relies on lower-granularity summaries (daily/weekly/monthly/yearly). For monthly statistics, the platform supports long-term trend analysis and KPI tracking, and the maximum historical horizon aligns with the long-term statistics retention boundary used by NetEco reporting, which is up to 5 years. This design ensures fast query response, manageable database growth, and clear separation between short-term operational detail (hourly) and long-term management analysis (monthly/yearly).
A
Explanation:
In Huawei NetEco statistical reporting, the query range is constrained by the report data retention policy and how summary data is stored. For hourly statistics, the platform keeps a limited window of high-granularity data to balance storage consumption and performance. The hourly report retention is 120 hours, which equals 5 days. That is why hourly statistics queries are limited to 5 days―beyond that window, hourly granularity is no longer retained in the report database for direct querying. For longer time horizons, NetEco relies on lower-granularity summaries (daily/weekly/monthly/yearly). For monthly statistics, the platform supports long-term trend analysis and KPI tracking, and the maximum historical horizon aligns with the long-term statistics retention boundary used by NetEco reporting, which is up to 5 years. This design ensures fast query response, manageable database growth, and clear separation between short-term operational detail (hourly) and long-term management analysis (monthly/yearly).
Question #15
The NetEco service program backend can be accessed through the iBMC port.
- A . True
- B . False
Correct Answer: B
B
Explanation:
In Huawei data center facility management, NetEco is the management software platform (server/application) used to centrally monitor and manage sites, while iBMC is the out-of-band hardware management interface used for server remote maintenance (such as power control, hardware health, BIOS settings, and remote console) on the specific server where iBMC exists. The iBMC port is not a service access interface for NetEco. NetEco’s backend services are accessed through the server operating system network interfaces (management/service network) and corresponding application ports after the server is properly networked and configured. Even if NetEco is deployed on a Huawei server that has iBMC, iBMC only provides a channel to manage the server hardware and does not expose NetEco application access as an official commissioning/O&M path. Therefore, NetEco backend access should be planned via the site’s management network (IP addressing, routing, security policy), not via iBMC.
B
Explanation:
In Huawei data center facility management, NetEco is the management software platform (server/application) used to centrally monitor and manage sites, while iBMC is the out-of-band hardware management interface used for server remote maintenance (such as power control, hardware health, BIOS settings, and remote console) on the specific server where iBMC exists. The iBMC port is not a service access interface for NetEco. NetEco’s backend services are accessed through the server operating system network interfaces (management/service network) and corresponding application ports after the server is properly networked and configured. Even if NetEco is deployed on a Huawei server that has iBMC, iBMC only provides a channel to manage the server hardware and does not expose NetEco application access as an official commissioning/O&M path. Therefore, NetEco backend access should be planned via the site’s management network (IP addressing, routing, security policy), not via iBMC.
Question #16
Which of the following statements are true about the industry trend of the data center cooling systems?
- A . Liquid cooling systems are widely used in high-density solutions.
- B . Cloud + AI C data centers enter a new energy-saving era.
- C . Evaporative cooling systems become the main solution for large data centers.
- D . Higher inlet and outlet water temperatures are the trend of large data center cooling.
Correct Answer: A, B, D
A, B, D
Explanation:
As data center power density increases (especially driven by AI and high-performance computing), the industry trend is to adopt liquid cooling in high-density scenarios because liquid has much higher heat transfer capability than air, enabling stable cooling where rack power is very high. This makes statement A true. The combination of Cloud + AI pushes operators to reduce PUE and total energy cost through more intelligent control, higher efficiency cooling architectures, and integrated energy management, so statement B is also true. For large data centers, another clear trend is increasing chilled-water supply/return temperatures (higher inlet and outlet temperatures). Warmer water improves chiller efficiency, expands the number of hours that free cooling can be used, and reduces compressor work, so D is true. However, evaporative cooling is not universally the “main solution” for large data centers because it is climate- and water-condition dependent and is typically deployed as one option among multiple architectures rather than the dominant default everywhere. Therefore, C is the incorrect statement.
A, B, D
Explanation:
As data center power density increases (especially driven by AI and high-performance computing), the industry trend is to adopt liquid cooling in high-density scenarios because liquid has much higher heat transfer capability than air, enabling stable cooling where rack power is very high. This makes statement A true. The combination of Cloud + AI pushes operators to reduce PUE and total energy cost through more intelligent control, higher efficiency cooling architectures, and integrated energy management, so statement B is also true. For large data centers, another clear trend is increasing chilled-water supply/return temperatures (higher inlet and outlet temperatures). Warmer water improves chiller efficiency, expands the number of hours that free cooling can be used, and reduces compressor work, so D is true. However, evaporative cooling is not universally the “main solution” for large data centers because it is climate- and water-condition dependent and is typically deployed as one option among multiple architectures rather than the dominant default everywhere. Therefore, C is the incorrect statement.
Question #17
The default address of the WAN1 port on the ECC800-Pro is
- A . 192.168.0.10
- B . 192.168.248.10
- C . 192.168.248.1
- D . 192.168.8.10
Correct Answer: D
D
Explanation:
In Huawei smart module commissioning, the ECC800-Pro controller provides a dedicated management access path through its WAN ports. For on-site startup commissioning, technicians typically connect a laptop directly to WAN1 and place the laptop IP address in the same subnet as the controller so they can open the WebUI and complete initial settings (time, network, device discovery, alarm checks, linkage tests, and parameter commissioning). The factory default IP address for WAN1 is 192.168.8.10, which is used as the initial access point before the address is planned and changed to match the customer’s management network. This default design supports quick “point-to-point” commissioning without depending on upstream switches, DHCP services, or enterprise IP planning at the very beginning of deployment. After login, Huawei commissioning practice is to harden access (password/authentication completion), then update network parameters and integrate the ECC800-Pro into the site monitoring network to enable continuous O&M, remote alarm reporting, and device management.
D
Explanation:
In Huawei smart module commissioning, the ECC800-Pro controller provides a dedicated management access path through its WAN ports. For on-site startup commissioning, technicians typically connect a laptop directly to WAN1 and place the laptop IP address in the same subnet as the controller so they can open the WebUI and complete initial settings (time, network, device discovery, alarm checks, linkage tests, and parameter commissioning). The factory default IP address for WAN1 is 192.168.8.10, which is used as the initial access point before the address is planned and changed to match the customer’s management network. This default design supports quick “point-to-point” commissioning without depending on upstream switches, DHCP services, or enterprise IP planning at the very beginning of deployment. After login, Huawei commissioning practice is to harden access (password/authentication completion), then update network parameters and integrate the ECC800-Pro into the site monitoring network to enable continuous O&M, remote alarm reporting, and device management.
Question #18
Which of the following statements is false about the advantages of the free cooling solution for data centers?
- A . The current technology is not mature enough and should be used with caution.
- B . Has many use cases in the industry.
- C . Directly uses the cooling capacity of the outdoor cooling source, resulting in ultra-low energy consumption.
- D . Makes full use of the seasonal temperature difference of air and water sources.
Correct Answer: A
A
Explanation:
Free cooling is a mainstream energy-saving concept in data center cooling design, used to reduce chiller compressor runtime by leveraging low outdoor temperatures (air-side) or low cooling-water temperatures (water-side) during suitable seasons. Therefore, describing the technology as “not mature enough and should be used with caution” is the false statement when discussing its advantages. In practice, free cooling has broad industry adoption and is considered a proven approach when applied with correct engineering, such as proper filtration, anti-condensation control, heat exchanger selection, and automatic control strategies. Its advantage is that it can directly utilize the outdoor “cold source” to remove heat, which significantly reduces cooling power consumption compared with full mechanical refrigeration, improving overall energy efficiency and supporting lower PUE targets. It also makes full use of seasonal and day-night temperature differences: the system dynamically switches among free cooling, partial free cooling, and mechanical cooling to balance reliability and efficiency. The key point is maturity: the benefit of free cooling comes from well-established principles and widely implemented architectures, not experimental technology.
A
Explanation:
Free cooling is a mainstream energy-saving concept in data center cooling design, used to reduce chiller compressor runtime by leveraging low outdoor temperatures (air-side) or low cooling-water temperatures (water-side) during suitable seasons. Therefore, describing the technology as “not mature enough and should be used with caution” is the false statement when discussing its advantages. In practice, free cooling has broad industry adoption and is considered a proven approach when applied with correct engineering, such as proper filtration, anti-condensation control, heat exchanger selection, and automatic control strategies. Its advantage is that it can directly utilize the outdoor “cold source” to remove heat, which significantly reduces cooling power consumption compared with full mechanical refrigeration, improving overall energy efficiency and supporting lower PUE targets. It also makes full use of seasonal and day-night temperature differences: the system dynamically switches among free cooling, partial free cooling, and mechanical cooling to balance reliability and efficiency. The key point is maturity: the benefit of free cooling comes from well-established principles and widely implemented architectures, not experimental technology.
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