Pass the Huawei HCIA-Cloud Service H13-811_V3.5 Questions and answers with CertsForce

Option B is incorrect . Huawei Cloud explicitly requires subnet CIDR blocks within the same VPC to be unique and not overlap . Allowing overlapping subnets would make local route selection ambiguous and create address conflicts inside the VPC. Huawei's subnet definition therefore states that subnets in a VPC cannot overlap with each other.

Option A is correct for subnet planning: Huawei advises users to plan subnet address ranges carefully because a subnet's CIDR block cannot be changed after creation. This is why future capacity requirements should be considered before allocating subnet prefixes.

Option C is also consistent with Huawei's VPC definition. A subnet represents a unique CIDR block containing an IP address range inside a VPC, and VPC resources requiring private networking are deployed into these subnets. Option D is correct because the subnet CIDR must fall within the VPC's address range. Huawei's network-planning guidance explicitly states that the subnet CIDR block must be within the VPC CIDR block and that subnet CIDR blocks in the VPC must be unique.

Thus, the only incorrect planning statement is B .

Reference topics: VPC and Subnet Planning; CIDR Blocks; Subnet Addressing; VPC Network Design.

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Options A, B, and C are consistent with the fundamental characteristics and enabling technologies of cloud computing. Cloud platforms are designed to make resources elastic. Huawei Cloud Auto Scaling, for example, dynamically adds or removes ECS instances and adjusts related resources according to actual workload demand. Dynamic resource scaling is therefore a core practical capability of cloud computing.

On-demand deployment is also fundamental. Huawei Cloud's Cloud Adoption Framework explains that cloud resources can be provisioned, adjusted, and scaled rapidly without the traditional procurement and installation cycle associated with physical infrastructure. This allows organizations to create computing environments when needed and release them when demand decreases.

Virtualization is another important enabling technology. It allows physical computing resources to be abstracted, pooled, isolated, and efficiently shared among multiple workloads. Huawei Cloud specifically identifies virtualization and resource pooling as mechanisms that improve physical-resource utilization.

Option D is incorrect. A defining cloud characteristic is that the provider assumes responsibility for substantial portions of infrastructure construction and maintenance. The exact customer/provider boundary varies between IaaS, PaaS, and SaaS, but customers do not maintain all resources .

Reference topics: Cloud Computing Characteristics; Elasticity; On-Demand Provisioning; Virtualization; Shared Responsibility.

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Statements B and C are false . Huawei Cloud distinguishes alarm-based, scheduled, and periodic Auto Scaling policies. An alarm policy triggers a scaling operation in response to monitored metrics such as CPU utilization. Scaling “every three hours” is time-interval behavior and therefore belongs to a periodic policy , not an alarm policy. This makes B incorrect.

Statement C is also incorrect. The expected number of instances is the desired number of ECS instances that should currently run within an AS group. Huawei specifies that this value must remain between the configured minimum and maximum instance counts. It can be modified manually or changed through scheduled, periodic, or alarm-based policies. It is not synonymous with the minimum instance count during peak hours.

Statement A is valid because an AS configuration can use a Huawei Cloud public image; Huawei's AS configuration parameters explicitly support public, private, and shared images.

Statement D is also valid. Huawei specifies that when an existing ECS is manually added to an AS group, the ECS must not already be a member of another AS group .

Consequently, the two false statements are B and C .

Reference topics: Auto Scaling Configurations; AS Policies; Expected Instances; AS Groups.

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Option C is incorrect under the HCIA-Cloud Service V3.5 networking model . Huawei Cloud's V3.5-era VPC documentation differentiates the two access-control mechanisms by their scope and rule behavior: security groups protect cloud server instances and use allow rules, whereas network ACLs protect subnets and support both allow and deny rules . Therefore, the statement that both mechanisms support both rule actions is inconsistent with the curriculum version used by this examination.

Option A is correct because a network ACL is associated with one or more subnets and controls traffic entering or leaving those subnets. Option D is also correct because security groups provide instance-level access control for resources such as ECSs. Huawei describes a security group as a collection of traffic-control rules applied to instances sharing common security requirements.

Option B is technically correct because these mechanisms can be layered. A security group provides access control around ECS instances, while a network ACL adds another security-control boundary around the subnet. Huawei specifically recommends using them together where comprehensive or fine-grained network protection is required.

Reference topics: Security Groups; Network ACLs; VPC Access Control; Defense-in-Depth.

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Option A is correct . Huawei Cloud Elastic Load Balance provides several traffic-distribution algorithms, including weighted round robin, weighted least connections, and source IP hash for shared load balancers. When backend servers have equal weights under weighted round robin, they receive an equal proportion of requests, providing the even traffic distribution described in the question.

Auto Scaling and ELB are explicitly integrated. When an AS group is associated with a load balancer, Huawei Cloud automatically associates newly added ECS instances with the load balancer and removes the association when instances leave the AS group. Therefore, option C is false; administrators do not need to manually register each dynamically created instance one by one.

Option B is incorrect in this context because the load balancer and its AS resources operate within the applicable regional/VPC deployment architecture; a standard shared ELB is not a mechanism for arbitrary cross-region backend distribution. Option D is also false because detecting unhealthy instances depends upon an enabled health-check mechanism. Disabling health checking removes the basis for making that health determination.

Reference topics: Elastic Load Balance; Auto Scaling and ELB Integration; Backend Servers; Load Balancing Algorithms.

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Options B and C are incorrect because they reverse the isolation characteristics of IAM projects and enterprise projects . Huawei Cloud defines enterprise projects as a mechanism for grouping and managing resources across regions. Resources assigned to different enterprise projects are logically isolated , and a single enterprise project can contain resources residing in multiple regions. Supported resources can also be added to, removed from, or transferred between enterprise projects. Consequently, statements A and D correctly describe Enterprise Project Management.

IAM projects operate differently. Huawei Cloud documentation states that IAM projects are region-oriented and are used to group and physically isolate resources within a region . A project corresponds to a region, and an IAM project does not provide the cross-region logical grouping model associated with enterprise projects.

Therefore, B is wrong because it attributes physical, same-region isolation to enterprise projects, while C is wrong because it attributes logical isolation to IAM projects. The two concepts are intentionally distinguished in Huawei Cloud architecture: IAM project = regional/physical isolation; enterprise project = cross-region/logical resource organization .

Reference topics: IAM Projects; Enterprise Projects; Resource Isolation; Enterprise Management.

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Option C cannot be the cause because the password used to log in to the ECS operating system has no requirement to match the database credential used by an RDS instance. ECS authentication and RDS database authentication are separate security domains. An application running on an ECS connects to RDS using the database endpoint, port, database username, and corresponding database password.

Option A can cause the failure. Huawei's RDS troubleshooting guidance requires appropriate security-group rules so that traffic to the database port is permitted.

Option B can also prevent communication. Huawei Cloud states that when an ECS and RDS DB instance are deployed in different VPCs, network connectivity must be established—for example through an appropriate VPC peering connection —or the resources must be placed in a mutually reachable network.

Option D can likewise cause connection failure. Huawei's official RDS troubleshooting process specifically instructs administrators to validate the connection address and port configuration and test connectivity to the RDS listening port. Examples include port 3306 for RDS for MySQL and 5432 for PostgreSQL.

The ECS's own login password is unrelated to these connectivity requirements; therefore C is correct.

Reference topics: RDS Database Connectivity; ECS-to-RDS Communication; Security Groups; VPC Peering; Database Ports.

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The statement is TRUE . Logging is a fundamental component of cloud operation, maintenance, troubleshooting, security auditing, and lifecycle management. Huawei Cloud Log Tank Service is designed to collect and centrally process logs from a broad range of environments, including cloud services, ECSs, physical servers, containers, network-related systems, APIs, and other infrastructure components.

Huawei describes LTS as a platform for application O & M, security and compliance, and operations analysis . It provides full-stack log collection, high-speed searching, SQL analysis, visualization, alarm generation, processing, and log transfer. These capabilities allow administrators to track system behavior from deployment through normal operation, troubleshooting, scaling, upgrades, incident response, and eventual retirement.

Huawei's logging architecture also supports network-device information through protocols such as Syslog and SNMP, while ICAgent can collect logs from physical servers and ECSs. Cloud-service logs can be ingested directly from numerous Huawei Cloud services.

Logs therefore provide historical evidence and real-time operational insight throughout the lifecycle of infrastructure and applications. They are not limited to fault diagnosis after an incident; they are an integral O & M data source.

Reference topics: Log Management; LTS; Device O & M; Log Collection; Operational Analysis.

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