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ACA System Operator certification
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Which command is used to get the Docker daemon information?
docker info
docker version
docker pull
docker image
Explanation: https://docs.docker.com/engine/reference/commandline/info/
When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources.
Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)
Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.
Applies indices to fields to contain many records.
A table should not contaiiAiore than 6 indexed fields.
Apply indexing to fields of fixed length (preferably not long fields).
Adhere to the rightmost prefix principle when using composite indexes
Which of the following steps is NOT mandatory when creating an API through Alibaba Cloud API Gateway?
Define basic API information
Attach a domain name
Define API Request parameters
Define the API backend service
Explanation:
https://www.alibabacloud.com/help/doc-detail/29478.htm
Which of the following statements about ECS Snapshot is NOT correct?
You can manually create snapshots
You can create automatic snapshots
You can roll back a disk by using a snapshot
You can create an ECS instance from a snapshot
Explanation:
You can create a custom image from a snapshot that contains the operating system and data of an ECS instance. Then, you can use the custom image to create multiple instances that have identical application environments.
https://www.alibabacloud.com/help/doc-detail/25391.htm
Your company decided to replicate the whole cloud environment in another region and use it as a cross-region failover in disaster recovery scenarios.
Your current environment includes Elastic Compute Service (ECS) instances, Server Load Balancer (SLB) instances and Relational Database Service (RDS) instances.
Which of the following statements is correct?
You can provision multiple ECS instances in multiple regions, thereby leveraging automatic high availability across regions
You can provision multiple SLB instances in multiple regions, thereby leveraging automatic high availability across regions
You can use DNS to resolve domain names to the IP addresses of multiple ECS instances running in different regions
You can use DNS to resolve domain names to the IP addresses of multiple SLB instances running in different regions
Explanation:
https://cloudacademy.com/course/alibaba-server-load-balancer-1066/alibabas-high-availability/
Which Alibaba Cloud service is an automated operations and maintenance (O&M) service to execute O&M tasks?
Operation Orchestration Service (OOS)
Maintenance Orchestration Service (MOS)
Resource Orchestration Service (ROS)
Resource Access Management (RAM)
Explanation:
https://www.alibabacloud.com/help/doc-detail/120556.htm
ApsaraDB for HBase is a cost-effective cloud-based intelligent SQL service that is of high scalability and compatible with the open source HBase.
True
False
Explanation:
https://www.alibabacloud.com/help/doc-detail/49501.htm
Which of the following options correctly describes Cloud Monitor Custom Monitoring and Custom Events? (Number of correct answers: 2)
Custom Events is used for collection of continuous event type data, queries, and alarms
Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms
Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms
Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts
Explanation:
https://www.alibabacloud.com/help/doc-detail/35170.htm
is a fully-managed event-driven computing service that allows you to run code in an elastic and reliable way?
Function Compute
Serverless Workflow
Elastic Compute Service (ECS)
Batch Compute
Which configuration language does Terraform support?
Python
XML
HCL
YAML
Explanation: https://www.terraform.io/docs/language/syntax/configuration.html
A developer needs to use some sensitive business data and operational data in the process of developing a program, but the data should be protected (encrypted or anonymized) as much as possible. In order to facilitate and secure management of data encryption keys, the developer can use Alibaba Cloud Key Management Service (KMS) envelope encryption technology.
Which of these statements is NOT correct, regarding KMS?
Developers can generate a plaintext data key and a ciphertext data key by calling the Generate Data Key interface.
Envelope encryption is an encryption mechanism similar to digital envelope technology. The technology allows you to store, transfer and use encrypted data by encapsulating their Data Keys (DKs) in an envelope, instead of y encrypting/decrypting data directly with Customer Master Keys (CMKs).
The user uses the master key created on KMS to encrypt and decrypt the generated data key.
The master key generated by KMS is also kept by the user.
Which of these Alibaba Cloud services are used for security (either credentials management, logging, or auditing?) (Number of correct answers: 3)
ActionTrail
Log Service
Key Management Service (KMS)
Table store
You need to log all actions taken by users of your Alibaba Cloud account, whether via the command line tools or the web console.
Which Alibaba Cloud product can you use to create a log of user operations?
CloudMonitor
ActionTrail
Cloud Configo
Resource Group
Explanation:
https://www.alibabacloud.com/help/doc-detail/28804.htm
Which of these are important concepts in Terraformâs configuration language, HCL? (Number of correct answers: 3)
Provider
Variable
Resource
Service Mesh
Which database utility is suitable for automate perception, healing, optimization, O&M, and security assurance for databases?
DMS
DBS
DTS
DAS
Which of the following services is used to establish private network connections between virtual private clouds (VPCs) in different regions, or between VPCs and data centers?
CEN (Cloud Enterprise Network)
Express Connect
VPN Gateway
NAT Gateway
Explanation:
https://www.alibabacloud.com/help/doc-detail/59870.htm
Alibaba Cloud Cloud Monitor is a service that monitors Alibaba Cloud resources and internet applications. Which of the following functions are provided by Cloud Monitor? (Number of correct answers: 4)
Site monitoring
Cloud product monitoring
Custom monitoring
Alerts
Custom firewall
Explanation:
https://www.alibabacloud.com/help/doc-detail/35170.htm
A system operator can tag resources for costing and billing purposes.
True
False
As the system administrator of a multinational company, you are responsible for the accounts and resources management on the cloud.
Which of the following solutions are suitable for your companyâs IT Governance? (Number of correct answers: 3)
Use role-based SSO for Identities access, use resource directory to manage the resources in shared service account and master account
Use CEN for interconnecting different networks globally, use shared VPC to share services between different organizations
Use Cloud Config and Action Trail for compliance and audit
Use one single VPC for all the resources to have the best performance
Stop using Action Trail and Cloud Config to save the storage cost
Explanation: https://www.alibabacloud.com/solutions/it-governance
Alibaba Cloud Action Trail is a service that monitors and records the actions of your Alibaba Cloud account, including the access to and use of cloud products and services through the Alibaba Cloud console, API operations, and SDKs.
True
False
Explanation: