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Alibaba ACA Cloud Computing study materials
Alibaba ACA Cloud Computing study resources

Alibaba ACA Cloud Computing practice questions

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Question 1Cloud Computing Fundamentals and Alibaba Cloud Overview

Which statement best describes the essential characteristic of cloud computing that lets a provider pool resources to serve multiple customers from shared infrastructure?

  1. Dedicated single-tenant hardware per customer
  2. Manual capacity provisioning by the customer
  3. Multi-tenancy with resource pooling Correct answer.
  4. Fixed capacity that cannot be adjusted

Explanation

Cloud providers achieve economies of scale by pooling computing resources and dynamically assigning them to many customers, a model called multi-tenancy. Customers share underlying hardware while remaining logically isolated from one another.

Question 2Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants to run workloads without managing any servers, operating systems, or runtime patches. Which cloud service model fits this requirement?

  1. Serverless computing Correct answer.
  2. Platform as a Service
  3. Infrastructure as a Service
  4. Bare metal hosting

Explanation

Serverless computing abstracts away servers, operating systems, and runtime management, leaving the customer responsible only for code and configuration. The provider handles scaling and infrastructure maintenance.

Question 3Cloud Computing Fundamentals and Alibaba Cloud Overview

Which of the following is the primary benefit of deploying applications across multiple Availability Zones within a single region?

  1. Reduced need for any backup strategy
  2. Elimination of all data residency requirements
  3. Lower network latency between zones
  4. Protection against a single data center failure Correct answer.

Explanation

Availability Zones are physically separate data centers within a region with independent power and networking. Distributing workloads across zones protects against the failure of any single facility.

Question 4Cloud Computing Fundamentals and Alibaba Cloud Overview

What is the main purpose of an Alibaba Cloud region?

  1. To isolate a single virtual private cloud
  2. To host only object storage services
  3. To group Availability Zones in a defined geographic area Correct answer.
  4. To provide a global content delivery network

Explanation

A region is a geographic area containing one or more Availability Zones that are isolated from other regions. Customers choose a region to meet latency, compliance, and data residency needs.

Question 5Cloud Computing Fundamentals and Alibaba Cloud Overview

Which cloud characteristic allows resources to be automatically scaled up or down to match current demand?

  1. Virtualization
  2. Federation
  3. Elasticity Correct answer.
  4. Durability

Explanation

Elasticity is the ability to provision and release resources automatically as demand changes. It lets customers match capacity to workload without long-term over-provisioning.

Question 6Cloud Computing Fundamentals and Alibaba Cloud Overview

A startup needs to rent virtual machines and control the operating system while the provider manages the physical hardware. Which service model is being used?

  1. Platform as a Service
  2. Infrastructure as a Service Correct answer.
  3. Function as a Service
  4. Software as a Service

Explanation

IaaS provides virtualized compute, storage, and networking while the customer manages the guest OS and above. The provider is responsible only for the physical infrastructure and hypervisor.

Question 7Cloud Computing Fundamentals and Alibaba Cloud Overview

In the shared responsibility model for cloud computing, which task remains the customer's responsibility regardless of service model?

  1. Maintaining the hypervisor layer
  2. Replacing failed physical disks
  3. Managing user access and data classification Correct answer.
  4. Physical security of the data center

Explanation

The provider secures the physical infrastructure, while the customer always remains accountable for their own data, identities, and access policies. This responsibility never transfers to the provider.

Question 8Cloud Computing Fundamentals and Alibaba Cloud Overview

Which term describes the ability of a cloud service to continue operating and recover data when components fail?

  1. Elasticity
  2. Reliability Correct answer.
  3. Scalability
  4. Portability

Explanation

Reliability refers to a system continuing to function correctly and recovering from failures. Scalability and elasticity concern capacity, while portability concerns moving workloads between environments.

Question 9Cloud Computing Fundamentals and Alibaba Cloud Overview

An application must serve users in Europe with low latency and keep data stored within the EU. Which design decision best satisfies both requirements?

  1. Deploy only to edge nodes without a region
  2. Deploy in a single zone in Asia and use a CDN
  3. Deploy in a US region and enable cross-region replication
  4. Deploy in an EU region and use multiple zones there Correct answer.

Explanation

Choosing an EU region keeps data resident in the EU and places compute near European users, reducing latency. Multiple zones within that region add resilience without moving data outside the jurisdiction.

Question 10Cloud Computing Fundamentals and Alibaba Cloud Overview

A team wants to run a stateless web front end that scales automatically with traffic and requires no server management. Which Alibaba Cloud approach is most appropriate?

  1. Host the front end on a self-managed database server
  2. Run the app on a single dedicated host
  3. Provision fixed ECS instances with manual scaling
  4. Use Auto Scaling with ECS instances behind a load balancer Correct answer.

Explanation

Auto Scaling with ECS behind a load balancer automatically adjusts instance count to match demand while distributing traffic. This achieves elasticity with less manual intervention than fixed provisioning.

Question 11Cloud Computing Fundamentals and Alibaba Cloud Overview

Which statement accurately contrasts public cloud and private cloud?

  1. Public cloud is always cheaper than private cloud for every workload
  2. Public cloud forbids multi-tenancy by design
  3. Public cloud resources are shared among customers, while private cloud is dedicated to one organization Correct answer.
  4. Private cloud cannot use virtualization technology

Explanation

Public cloud delivers pooled resources over the internet to many customers, whereas private cloud infrastructure is dedicated to a single organization. Cost and control trade-offs vary by workload.

Question 12Cloud Computing Fundamentals and Alibaba Cloud Overview

What distinguishes a hybrid cloud deployment from a multi-cloud deployment?

  1. Hybrid combines private infrastructure with public cloud, while multi-cloud uses two or more public providers Correct answer.
  2. Hybrid requires no networking between environments, while multi-cloud does
  3. Hybrid and multi-cloud are identical concepts with different names
  4. Hybrid uses only one provider, while multi-cloud uses only private data centers

Explanation

Hybrid cloud integrates private infrastructure with public cloud services, often through secure connectivity. Multi-cloud involves using services from more than one public cloud provider.

Question 13Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants to move a legacy application to the cloud with minimal changes to reduce risk. Which migration strategy does this describe?

  1. Rehosting Correct answer.
  2. Refactoring
  3. Retiring
  4. Rebuilding

Explanation

Rehosting, often called lift-and-shift, moves an application to the cloud with little or no modification. It minimizes change risk and effort compared with refactoring or rebuilding.

Question 14Cloud Computing Fundamentals and Alibaba Cloud Overview

Which Alibaba Cloud concept describes a logically isolated virtual network that a customer defines and controls?

  1. Content Delivery Network
  2. Object Storage Service
  3. Virtual Private Cloud Correct answer.
  4. Resource Access Management

Explanation

A Virtual Private Cloud (VPC) is a logically isolated network in which customers define subnets, routing, and security controls. It provides network isolation for cloud resources.

Question 15Cloud Computing Fundamentals and Alibaba Cloud Overview

Why would an architect place an application server in a private subnet rather than a public subnet?

  1. To increase the server's CPU performance
  2. To prevent direct inbound internet access to the server Correct answer.
  3. To avoid the need for any security groups
  4. To guarantee unlimited storage capacity

Explanation

Private subnets have no direct route to the internet, so resources inside are shielded from direct inbound access. Internet-facing components can sit in public subnets and forward traffic internally.

Question 16Cloud Computing Fundamentals and Alibaba Cloud Overview

Which statement best describes the role of an Alibaba Cloud Availability Zone?

  1. A physically separate data center with independent power and network within a region Correct answer.
  2. A billing unit for subscription pricing
  3. A software-defined firewall policy
  4. A global DNS resolution service

Explanation

An Availability Zone is an isolated physical facility within a region, with independent power, cooling, and networking. Deploying across zones protects against single-facility failures.

Question 17Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants fine-grained control over who can start, stop, or delete cloud resources. Which Alibaba Cloud service addresses this need?

  1. Auto Scaling
  2. Resource Access Management Correct answer.
  3. Server Load Balancer
  4. Cloud Monitor

Explanation

Resource Access Management (RAM) controls identities, permissions, and policies for cloud resources. It lets administrators grant least-privilege access to users and roles.

Question 18Cloud Computing Fundamentals and Alibaba Cloud Overview

Which factor most directly determines the latency users experience when connecting to an application hosted in a single Alibaba Cloud region?

  1. The number of VPCs in the account
  2. The billing method of the ECS instances
  3. The geographic distance between users and the chosen region Correct answer.
  4. The storage class selected for backups

Explanation

Network latency is dominated by physical distance and the path between users and the region hosting the application. Choosing a closer region or using edge delivery reduces latency.

Question 19Cloud Computing Fundamentals and Alibaba Cloud Overview

A team is comparing IaaS and PaaS for a new application. Which consideration most favors PaaS?

  1. The provider manages the OS and runtime, reducing operational overhead Correct answer.
  2. The customer gets full control of the guest operating system
  3. PaaS always provides lower network latency than IaaS
  4. The customer can install any custom kernel module

Explanation

PaaS abstracts the operating system and runtime, so the customer focuses on application code rather than infrastructure maintenance. This reduces operational burden compared with IaaS.

Question 20Cloud Computing Fundamentals and Alibaba Cloud Overview

Which statement best explains why cloud providers can offer elastic capacity on demand?

  1. They require customers to pre-purchase fixed hardware
  2. They maintain large shared resource pools and allocate them dynamically Correct answer.
  3. They disable virtualization to improve performance
  4. They limit each customer to a single physical server

Explanation

Providers operate large pools of shared resources and allocate or reclaim them dynamically as customers need. This pooling is what enables rapid, on-demand elasticity.

Question 21Cloud Computing Fundamentals and Alibaba Cloud Overview

An architect must design a system that tolerates the loss of an entire data center while keeping data within a single country. Which approach best meets these requirements?

  1. Deploy across multiple Availability Zones within one region in that country Correct answer.
  2. Deploy across two regions in different countries
  3. Deploy to a single Availability Zone with backups
  4. Deploy only to edge CDN nodes

Explanation

Multiple Availability Zones within one region provide data-center-level fault tolerance while keeping data in the same country. Spreading across countries would violate the residency constraint.

Question 22Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants to minimize operational overhead while retaining control over the guest operating system and network configuration. Which service model best balances these goals?

  1. IaaS Correct answer.
  2. FaaS
  3. SaaS
  4. Managed database only

Explanation

IaaS gives the customer control of the guest OS and networking while the provider manages physical infrastructure. It therefore balances control with reduced hardware operations.

Question 23Cloud Computing Fundamentals and Alibaba Cloud Overview

A global retailer needs low-latency delivery of static images to users worldwide while keeping origin data in one region. Which combination is most appropriate?

  1. A single ECS instance serving images directly
  2. A CDN in front of an object storage origin in the chosen region Correct answer.
  3. A VPC peering connection between all regions
  4. A RAM policy granting public read access

Explanation

A CDN caches static content at edge locations close to users, reducing latency, while the authoritative origin remains in the chosen region. This satisfies global performance and central data control.

Question 24Cloud Computing Fundamentals and Alibaba Cloud Overview

Which scenario best illustrates the difference between scalability and elasticity?

  1. Encrypting data at rest versus encrypting data in transit
  2. Choosing reserved pricing versus pay-as-you-go pricing
  3. Using one region versus using multiple regions
  4. Adding capacity permanently for growth versus automatically matching capacity to fluctuating demand Correct answer.

Explanation

Scalability is the ability to grow capacity to handle increased load, often permanently. Elasticity is automatic, dynamic adjustment of capacity as demand rises and falls.

Question 25Cloud Computing Fundamentals and Alibaba Cloud Overview

A firm must keep sensitive workloads on-premises but wants to burst to public cloud during peak demand. Which deployment model and enabler are most appropriate?

  1. Public cloud only with no connectivity to on-premises
  2. Multi-cloud using two unrelated public providers
  3. Hybrid cloud with secure connectivity between on-premises and public cloud Correct answer.
  4. Private cloud only with no public capacity

Explanation

Hybrid cloud keeps sensitive workloads on-premises while allowing burst capacity in the public cloud. Secure connectivity such as a VPN or dedicated line links the two environments.

Question 26Cloud Computing Fundamentals and Alibaba Cloud Overview

Which characteristic of cloud computing lets a customer automatically add compute capacity during a traffic spike and release it afterward?

  1. Federation
  2. Virtualization
  3. Elasticity Correct answer.
  4. Colocation

Explanation

Elasticity is the ability to provision and release resources automatically to match current demand, scaling both up and down. It depends on underlying virtualization and pooled resources but describes the demand-matching behavior itself.

Question 27Cloud Computing Fundamentals and Alibaba Cloud Overview

Which cloud service model gives the customer the greatest amount of control over the runtime environment?

  1. Software as a Service
  2. Infrastructure as a Service Correct answer.
  3. Function as a Service
  4. Platform as a Service

Explanation

In IaaS the provider supplies compute, storage, and networking, while the customer manages operating systems, middleware, and applications. The other models abstract progressively more of the stack away from the customer.

Question 28Cloud Computing Fundamentals and Alibaba Cloud Overview

What is the primary purpose of a cloud region?

  1. To provide a geographic location containing multiple isolated data centers Correct answer.
  2. To group resources that share a single power and cooling system
  3. To cache content closer to end users than the origin server
  4. To define a billing currency for local customers

Explanation

A region is a geographic area that contains one or more isolated data centers, called zones, connected by low-latency links. Regions let customers place workloads near users and meet data-residency requirements.

Question 29Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants to avoid managing servers while running its own containerized application with automatic scaling. Which Alibaba Cloud offering fits best?

  1. ApsaraDB RDS for MySQL
  2. Container Service for Kubernetes with managed node pools Correct answer.
  3. Object Storage Service buckets
  4. Elastic Compute Service instances

Explanation

Managed Kubernetes on Alibaba Cloud lets the provider operate the control plane and node lifecycle while the customer deploys containers and scaling policies. This removes server management without giving up container orchestration.

Question 30Cloud Computing Fundamentals and Alibaba Cloud Overview

Which statement describes the relationship between fault tolerance and high availability?

  1. Fault tolerance removes single points of failure so service continues without interruption, while high availability minimizes downtime through rapid recovery Correct answer.
  2. Fault tolerance and high availability both require active-active deployment across two regions
  3. High availability guarantees zero downtime, while fault tolerance only shortens recovery time
  4. Fault tolerance is achieved by backups alone, while high availability requires redundancy

Explanation

Fault tolerance keeps a workload running through a component failure, typically using redundant components with no interruption. High availability accepts brief interruptions but uses health checks and failover to restore service quickly.

Question 31Cloud Computing Fundamentals and Alibaba Cloud Overview

An enterprise must prove to auditors that data stored in Alibaba Cloud remains within a specific country. Which capability should it rely on?

  1. Using a content delivery network with global edge nodes
  2. Choosing a random zone within any region at deployment time
  3. Selecting a region inside that country for all data-bearing services Correct answer.
  4. Enabling cross-region replication to a nearby country

Explanation

Data residency is controlled by the region in which data-bearing services are created, because a region maps to a geographic location. Keeping all storage and processing in an in-country region supports the audit requirement.

Question 32Cloud Computing Fundamentals and Alibaba Cloud Overview

Which benefit most directly results from multi-tenant resource pooling in a public cloud?

  1. Each customer receives dedicated physical servers
  2. Customers must forecast capacity years in advance
  3. Providers can spread fixed costs across many customers and lower unit prices Correct answer.
  4. Isolation between customers is no longer required

Explanation

Pooling many tenants onto shared infrastructure raises utilization, so the provider's fixed costs are divided among more users and unit prices fall. Strong logical isolation is still enforced between tenants.

Question 33Cloud Computing Fundamentals and Alibaba Cloud Overview

A team wants to run a batch job that can tolerate interruption and finish within a few hours at the lowest compute cost. Which Alibaba Cloud purchasing option suits this workload?

  1. Dedicated hosts reserved for the team
  2. Preemptible instances that may be reclaimed by the provider Correct answer.
  3. Subscription ECS instances billed monthly
  4. Pay-as-you-go ECS instances running continuously

Explanation

Preemptible instances offer large discounts because the provider can reclaim them when capacity is needed, which is acceptable for interruptible batch work. The job must be designed to checkpoint and resume.

Question 34Cloud Computing Fundamentals and Alibaba Cloud Overview

Which Alibaba Cloud service is designed to distribute incoming traffic across multiple backend servers in a virtual private cloud?

  1. Virtual Private Cloud
  2. Server Load Balancer Correct answer.
  3. Resource Access Management
  4. CloudMonitor

Explanation

Server Load Balancer accepts client traffic on a frontend listener and forwards it to a pool of backend servers, improving availability and scaling. The other services handle permissions, networking, and monitoring.

Question 35Cloud Computing Fundamentals and Alibaba Cloud Overview

A workload requires block storage attached to a single ECS instance for a relational database. Which Alibaba Cloud storage type matches this need?

  1. Object Storage Service
  2. Apsara File Storage NAS
  3. Elastic Block Storage disks Correct answer.
  4. A content delivery network

Explanation

Elastic Block Storage provides block-level disks that attach to an ECS instance and behave like local drives, which suits database files. Object and file storage offer different access semantics.

Question 36Cloud Computing Fundamentals and Alibaba Cloud Overview

A firm wants a managed relational database so its team avoids patching and backup automation. Which Alibaba Cloud service should it choose?

  1. ApsaraDB for RDS Correct answer.
  2. Server Load Balancer
  3. Table Store
  4. Elastic Compute Service with a self-installed database

Explanation

ApsaraDB for RDS is a managed relational database service in which the provider handles provisioning, patching, and backups. Self-managed databases on ECS leave those tasks to the customer.

Question 37Cloud Computing Fundamentals and Alibaba Cloud Overview

An architect must choose between vertical and horizontal scaling for a stateless API tier. Which reasoning is sound?

  1. Vertical scaling removes the need for a load balancer in all cases
  2. Vertical scaling adds instances, so it is the better choice for stateless services
  3. Horizontal scaling requires rewriting the application to be stateful
  4. Horizontal scaling adds instances behind a load balancer and avoids the upper size limit of a single server Correct answer.

Explanation

Horizontal scaling adds more instances and distributes traffic across them, so capacity is not capped by the largest available server size. Stateless services are especially easy to scale this way.

Question 38Cloud Computing Fundamentals and Alibaba Cloud Overview

A company wants its on-premises identity system to be the single source of truth while users access Alibaba Cloud consoles and APIs. Which service should it configure?

  1. ActionTrail with log delivery to Object Storage Service
  2. Virtual Private Cloud with a site-to-site VPN
  3. Resource Access Management with identity federation from the corporate directory Correct answer.
  4. CloudMonitor with alarm rules for login events

Explanation

Resource Access Management supports federated identities, so users authenticated by the corporate directory can assume RAM roles and access Alibaba Cloud resources. This keeps the existing directory authoritative.

Question 39Cloud Computing Fundamentals and Alibaba Cloud Overview

A team stores database backups in Object Storage Service and wants protection against accidental deletion or overwrite for a fixed retention period. Which feature addresses this?

  1. Lifecycle rules that transition objects to Archive storage
  2. Cross-region replication to a second bucket
  3. Bucket versioning combined with a retention policy Correct answer.
  4. Static website hosting on the bucket

Explanation

Versioning keeps prior object versions, and a retention policy prevents deletion or overwrite of protected versions for a set period, which supports compliance and recovery from accidental changes.

Question 40Cloud Computing Fundamentals and Alibaba Cloud Overview

A workload runs in a single zone and must survive the loss of that zone with minimal data loss. Which design meets the requirement?

  1. Deploy across multiple zones in the same region with synchronous data replication Correct answer.
  2. Take nightly snapshots of the instance's system disk and restore them on failure
  3. Increase the instance type to the largest available size
  4. Place a second instance in the same zone behind a load balancer

Explanation

Spreading the workload across zones in one region means a zone failure leaves replicas running elsewhere, and synchronous replication keeps data loss near zero. Nightly snapshots cannot meet a minimal-data-loss goal.

Question 41Compute Services (ECS)

Which Alibaba Cloud service provides resizable virtual machines with a choice of instance families such as general purpose, compute optimized, and memory optimized?

  1. Elastic Compute Service (ECS) Correct answer.
  2. Server Load Balancer (SLB)
  3. Object Storage Service (OSS)
  4. ApsaraDB for RDS

Explanation

ECS is the core IaaS compute offering on Alibaba Cloud, delivering virtual machines across multiple instance families tuned for different CPU-to-memory ratios. The other services listed are networking, storage, and managed database products rather than virtual machine compute.

Question 42Compute Services (ECS)

What is the primary purpose of an ECS image?

  1. To assign a public IP address to an instance
  2. To define the template used to create new ECS instances Correct answer.
  3. To monitor CPU and memory metrics
  4. To bill the instance on a subscription basis

Explanation

An image captures the operating system and preconfigured software that becomes the starting state of a new instance. Networking, monitoring, and billing are separate features configured independently of the image.

Question 43Compute Services (ECS)

Which disk category is shared block storage that delivers high random IOPS and is intended for latency-sensitive databases on ECS?

  1. ESSD (Enhanced SSD) Correct answer.
  2. Standard cloud disk
  3. Local disk
  4. OSS bucket

Explanation

ESSD is Alibaba Cloud's enhanced SSD-based cloud disk family designed for high IOPS and low latency workloads such as databases. Standard cloud disks are lower performance, local disks are tied to a single host, and OSS is object storage rather than block storage.

Question 44Compute Services (ECS)

Which ECS billing method charges for the instance by the second with no long-term commitment and can be released at any time?

  1. Reserved instance
  2. Savings plan
  3. Pay-as-you-go Correct answer.
  4. Subscription

Explanation

Pay-as-you-go (pay-by-traffic-style hourly/second billing) has no upfront commitment and can be stopped or released at will. Subscription, savings plans, and reserved instances all involve longer commitments in exchange for discounts.

Question 45Compute Services (ECS)

What is the function of a security group in ECS?

  1. It replicates instances across regions
  2. It acts as a stateful virtual firewall controlling inbound and outbound traffic Correct answer.
  3. It provides DNS resolution for the VPC
  4. It encrypts data at rest on cloud disks

Explanation

A security group is a stateful packet filter applied at the instance level, with allow rules for inbound and outbound directions. Disk encryption, cross-region replication, and DNS are handled by other services.

Question 46Compute Services (ECS)

Which component of an ECS instance determines the number of vCPUs and amount of memory?

  1. Instance type Correct answer.
  2. Image
  3. Security group
  4. Elastic IP address

Explanation

The instance type (instance family and size) specifies the vCPU and memory configuration of the instance. Images, security groups, and EIPs do not affect compute capacity.

Question 47Compute Services (ECS)

An application needs to persist data independently of the instance lifecycle so data survives instance release. Which ECS storage option should be used?

  1. Instance snapshot of RAM
  2. Local disk
  3. Instance memory
  4. Cloud disk (block storage) Correct answer.

Explanation

Cloud disks are independent block storage devices that persist beyond the life of an instance and can be detached and reattached. Local disks are tied to the host and are lost when the instance is released.

Question 48Compute Services (ECS)

Which Alibaba Cloud feature lets you automatically add or remove ECS instances based on metrics such as average CPU utilization?

  1. Server Load Balancer
  2. CloudMonitor alarm only
  3. Resource Orchestration Service
  4. Auto Scaling Correct answer.

Explanation

Auto Scaling adjusts the number of ECS instances in a scaling group according to scaling rules and CloudMonitor metrics. SLB only distributes traffic, alarms alone do not add capacity, and ROS is for infrastructure templating.

Question 49Compute Services (ECS)

What does an ECS snapshot capture?

  1. A point-in-time copy of a cloud disk Correct answer.
  2. A backup of the VPC route table
  3. A duplicate of the instance's public IP
  4. A copy of the instance's security group rules

Explanation

Snapshots are incremental point-in-time backups of cloud disks that can be used to restore or create new disks. They do not capture security group rules, route tables, or IP addresses.

Question 50Compute Services (ECS)

An instance must be reachable from the internet on a stable public address that can be remapped to another instance quickly. Which resource best fits?

  1. VPC peering connection
  2. NAT Gateway
  3. Elastic IP address Correct answer.
  4. Private IP address

Explanation

An Elastic IP is a public IP that can be associated and disassociated from instances, enabling fast remapping. Private IPs are not internet-routable, and NAT Gateway and peering serve outbound or VPC-to-VPC connectivity rather than a remappable public address.