alibaba ACP-CLOUD1 Exam Questions

Questions for the ACP-CLOUD1 were updated on : Nov 21 ,2025

Page 1 out of 12. Viewing questions 1-15 out of 176

Question 1

Which of the following database engines are compatible with RDS? (Choose three.)

  • A. MySQL
  • B. PostgreSQL
  • C. SQL Server
  • D. PPAS
  • E. Sybase
Answer:

A, B, C

User Votes:
A
50%
B
50%
C
50%
D
50%
E
50%

Explanation:
Alibaba Cloud RDS supports several popular database engines, including MySQL, PostgreSQL, and
SQL Server. PPAS (PostgreSQL Plus Advanced Server) is also supported but not Sybase, which is not
available as an RDS option on Alibaba Cloud.

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Question 2

A user builds an ECS + SLB + RDS architecture on Alibaba Cloud, with Auto Scaling to dynamically
manage ECS instances. For business needs, they use ApsaraDB for Redis as a cache for hot data,
requiring ECS instances to be added or removed from the Redis whitelist as they scale. As an Alibaba
Cloud architect, which three Auto Scaling and OOS features would you recommend to automate
adding and removing instances from the Redis whitelist? (Choose three.)

  • A. Auto-Scaling lifecycle hooks
  • B. OOS Template
  • C. MNS
  • D. Instance launch template
Answer:

A, B, C

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
Using lifecycle hooks in Auto Scaling allows for custom operations, such as updating the Redis
whitelist when instances are added or removed. An OOS (Operation Orchestration Service) template
can automate this process, and MNS (Message Notification Service) can trigger events to inform
Redis when changes occur.

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Question 3

In Auto Scaling, the cool-down time of a scaling group refers to the lockout period after a scaling
activity has been executed successfully. Which of the following statements about cool-down time are
true? (Choose two.)

  • A. During the cool-down time, only the scaling activities in the same scaling group are locked.
  • B. You can’t skip a scaling group’s cool-down time period right after a scaling activity is just finished.
  • C. When multiple ECS instances are added or removed from a scaling group, the cool-down time begins only when the last instance has been added or removed from the scaling group.
  • D. During the cool-down time of a scaling group, only the alarms from CloudMonitor can bypass the cool-down time and trigger scaling activities, whereas other scaling activities, such as manually triggered ones, will still be subject to the cool-down time.
Answer:

A, C

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
During cool-down time, scaling activities in the same scaling group are temporarily locked to avoid
unnecessary scaling activities. The cool-down time begins once all ECS instances in a multi-instance
scaling action are added or removed.

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Question 4

Alibaba Cloud Content Delivery Network (CDN) is a distributed network built on top of a base
network with edge node server clusters distributed across various regions. If a user finds that the
CDN cache hit rate is low, the possible reasons are ____________. (Choose three.)

  • A. When websites have low access traffic and the files are not popular enough, the CDN will receive fewer requests and result in a lower cache hit rate.
  • B. If the cache configuration is inappropriate (e.g., overly short Cache Expiry Time for popular files), this may result in frequent back-to-source operations.
  • C. Insufficient bandwidth was selected when enabling the CDN service, making the service capacity reach its limit.
  • D. If the origin site has a large number of dynamic resources or mostly non-cacheable content, this can also lead to frequent back-to-source operations.
  • E. The HTTP Header setting may cause the cache to fail. In this case, users must check the origin site’s “Cache-Control” and “Expires” settings.
Answer:

A, B, D

User Votes:
A
50%
B
50%
C
50%
D
50%
E
50%

Explanation:
A low CDN cache hit rate can be due to low website traffic, poor cache configurations (such as a
short Cache Expiry Time), or the presence of dynamic resources that require frequent retrieval from
the origin. Proper configuration of "Cache-Control" and "Expires" headers is necessary to ensure
caching.

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Question 5

Availability Zones refer to data centers in the same region with independent power grids and
networks. Which of the following statements are true for Zones? (Choose three.)

  • A. If the disaster recovery requirements of your applications are demanding, it is recommended that you deploy ECS instances in the same Region and Zone.
  • B. The network latency between inter-Zone ECS instances is lower.
  • C. Intranet communication is available between different Zones in the same region, and data center- level fault isolation can be achieved between Zones.
  • D. Whether you place ECS instances in the same Zone depends on the requirements for disaster recovery and network latency.
  • E. If your applications require low network latency between ECS instances, it is recommended that you create ECS instances in different Zones.
Answer:

B, C, D

User Votes:
A
50%
B
50%
C
50%
D
50%
E
50%

Explanation:
Zones in the same region support low-latency intranet communication, ideal for high-availability
deployments with inter-Zone fault isolation. Placement of ECS instances in the same or different
Zones depends on the disaster recovery and latency needs of the application.

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Question 6

When distributing loads to multiple ECS instances with an Alibaba Cloud Server Load Balancer (SLB),
you can obtain the real IP addresses of users who initiate the requests through _____________.
(Choose two.)

  • A. For Layer-7 services, SLB obtains the real IP addresses of the visitors by means of HTTP Header: X- Forwarded-For, but the “Obtain the Visitors Real IP Address” function must be enabled first.
  • B. For Layer-4 services, you can obtain the visitors' real IP addresses directly, without any additional settings.
  • C. For Layer-4 services, SLB obtains the real IP addresses of the visitors by means of the HTTP Header: X-Forwarded-For, but the “Obtain the Visitors Real IP Address” function must be enabled first.
  • D. For Layer-7 services, you can obtain the visitors' real IP addresses directly, without any additional settings.
Answer:

A, B

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
In Alibaba Cloud SLB, Layer-7 (HTTP/HTTPS) services require enabling the "X-Forwarded-For" header
to retrieve the real IP address of clients, while Layer-4 (TCP/UDP) services can obtain the real IP
address directly without additional settings.

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Question 7

Alibaba Cloud CloudMonitor allows you to customize monitoring metrics and alert policies. Which of
the following statements about customized monitoring are correct? (Choose two.)

  • A. Users can monitor concerned services and report collected monitoring data to CloudMonitor so that CloudMonitor processes the data and generates alerts according to the result.
  • B. Users can only select limited and fixed templates, and monitor specified server performance indicators.
  • C. The number of customized monitoring metrics is limited, and programs used to report metric data must be deployed on the Alibaba Cloud server.
  • D. The number of customized monitoring metrics is not limited, and programs used to report metric data may be deployed on devices other than the Alibaba Cloud server.
Answer:

A, D

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
CloudMonitor allows users to create custom monitoring metrics and report data, which can then be
analyzed and used for alerts. Customized monitoring is flexible, with no set limits on the number of
metrics, and users can report data from Alibaba Cloud servers or other devices.

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Question 8

Cloud computing adopts a common model in Distributed Systems. It distributes a computing task to a
resource pool (comprised of a large number of computers). Elastic utilization of the resource pool
allows applications to obtain computing capacity, storage space, and message services according to
needs. Which of the following statements are correct about cloud computing? (Choose four.)

  • A. Large scale
  • B. High availability
  • C. Service on demand
  • D. Versatility
  • E. Container-based
  • F. Only supports single tenant
Answer:

A, B, C, D

User Votes:
A
50%
B
50%
C
50%
D
50%
E
50%
F
50%

Explanation:
Cloud computing is characterized by large-scale infrastructure, high availability, on-demand service
provisioning, and versatility in handling diverse applications and workloads. It supports both multi-
tenant and single-tenant configurations, and although containerization is popular, cloud computing is
not limited to container-based architectures.

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Question 9

Alibaba Cloud OSS is a cloud storage service that features massive capacity, outstanding security, low
costs, and high reliability. When talking about information security, the advantages of using OSS are
____________. (Choose two.)

  • A. Supports Anti-DDoS, automatic traffic cleaning, and "black holing" without any extra charges.
  • B. Offers a multi-user isolation mechanism directly, with no need to leverage RAM.
  • C. Offers Server Side Encryption for data security protection in OSS.
  • D. Provides Primary/Secondary region configuration for data reliability protection.
Answer:

C, D

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
Alibaba Cloud OSS offers Server Side Encryption to protect data at rest, enhancing security. It also
supports multi-region replication with Primary/Secondary region configurations for additional data
reliability and disaster recovery. Anti-DDoS is not an inherent feature of OSS, and multi-user isolation
is achieved via Alibaba Cloud’s Resource Access Management (RAM).

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Question 10

Which of the following Alibaba Cloud products can provide Anti-DDoS service? (Choose two.)

  • A. Security Center
  • B. Anti-DDoS Origin Service
  • C. Anti-DDoS Pro Service
  • D. Cloud Firewall
Answer:

B, C

User Votes:
A
50%
B
50%
C
50%
D
50%

Explanation:
Alibaba Cloud provides two main products for Anti-DDoS protection: Anti-DDoS Origin Service,
which protects against attacks at the origin server level, and Anti-DDoS Pro Service, which offers
advanced DDoS mitigation for applications hosted on Alibaba Cloud. Security Center and Cloud
Firewall offer different security functionalities but do not provide direct Anti-DDoS services.

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Question 11

Alibaba Cloud's Object Storage Service (OSS) can be used to store a large amount of data, but there is
still a maximum number of files in a single bucket.

  • A. True
  • B. False
Answer:

B

User Votes:
A
50%
B
50%

Explanation:
There is no limit on the number of objects that can be stored in a single OSS bucket in Alibaba Cloud.
OSS is designed to support massive data storage, allowing users to store an unlimited number of files
within a bucket. The only limitations are the bucket storage capacity and account-level quotas.

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Question 12

Alibaba Cloud Object Storage is suitable for storing unstructured data such as pictures and videos.

  • A. True
  • B. False
Answer:

A

User Votes:
A
50%
B
50%

Explanation:
Alibaba Cloud Object Storage Service (OSS) is ideal for storing unstructured data, including media
files such as pictures, videos, and documents. OSS offers scalable storage, high durability, and easy
access, making it well-suited for handling large volumes of unstructured data.

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Question 13

After activating an SLB, it will be assigned an IP address. The SLB will keep this IP address until it is
released.

  • A. True
  • B. False
Answer:

A

User Votes:
A
50%
B
50%

Explanation:
Alibaba Cloud SLB instances are assigned a public or private IP address when created, and this IP
remains unchanged for the life of the SLB instance. The IP address will only be released when the SLB
instance itself is deleted.

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Question 14

In Auto Scaling, a scaling group refers to the collection of ECS instances deployed with the same
applications, where these ECS instances can be charged by monthly subscription or Pay-As-You-Go.
For scenarios with abrupt service traffic change, Pay-As-You-Go ECS instances can meet service
requirements while minimizing cost. For monthly subscription ECS instances, you can manually add
the idle instances to the scaling group to take full advantage of idle resources.

  • A. True
  • B. False
Answer:

A

User Votes:
A
50%
B
50%

Explanation:
Auto Scaling in Alibaba Cloud supports both Pay-As-You-Go and monthly subscription ECS instances
within a scaling group. Pay-As-You-Go instances provide flexibility during traffic surges, while idle
monthly subscription instances can be added manually to optimize costs and resource usage.

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Question 15

All versions of Alibaba Cloud RDS use master-slave mode to ensure high availability. When the
master database fails, RDS will switch to the standby database within 30 seconds.

  • A. True
  • B. False
Answer:

A

User Votes:
A
50%
B
50%

Explanation:
Alibaba Cloud RDS uses a master-slave or primary-replica architecture to provide high availability. In
the event of a master database failure, automatic failover to the standby instance generally occurs
within 30 seconds, helping to minimize downtime and maintain service continuity.

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