ACA-Developer Certification Exam Dumps Questions in here [Feb-2022]
Updated ACA-Developer Exam Practice Test Questions
Alibaba Cloud ACA-Developer Exam Syllabus Topics:
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NEW QUESTION 53
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)
- A. Adhere to the rightmost prefix principle when using composite indexes.
- B. Apply indexing to fields of fixed length (preferably not long fields).
- C. Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.
- D. table should not contain more than 6 indexed fields.
- E. Applies indices to fields that contain many records.
Answer: B,C,E
NEW QUESTION 54
During the process of backing up an RDS database, a developer found that the backup failed. What might cause this to happen?
- A. DML operations were performed during the backup
- B. DCL operations were performed during the backup
- C. DDL operations were performed during the backup
- D. The database instance is not stopped
Answer: A
NEW QUESTION 55
Which of the following descriptions of Alibaba Cloud ECS storage are correct? (Number of correct answers:
3)
- A. Two types of Cloud Disks can be attached to an ECS: System Disks and Data Disks. System Disks host the ECS instances operating system.
- B. Cloud Disks come In several different varieties: ESSD (Enhanced Solid State) Cloud Disks. SSD (Solid State ) Cloud Disks, and high-efficiency Cloud Disks.
- C. Alibaba Cloud provides a wealth of block storage products for ECS, including Cloud Disks (virtualized storage) and Local Disks (physically attached to the server(s) that host your ECS Instances).
- D. Both Local Disks and Cloud Disks use a multi-copy distributed storage mechanism, which has low latency, high performance, durability, and high reliability, and supports creation, expansion and release at any time.
Answer: B,C,D
NEW QUESTION 56
A developer is writing logs through the Log Service API, and can see via the Logstore monitorin metrics that write traffic is about 10 MB/s, but a 403 error is reported during the writing process. Which of these is a possible cause?
- A. The target partition in the Logstore is not specified
- B. The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds
- C. There is significant network delay
- D. There is not enough space in the Logstore partition
Answer: A
NEW QUESTION 57
Which of these are suitable use cases for Alibaba Cloud's MongoDB service? (Number of correct answers: 3)
- A. Applications requiring geo-location queries, such as logistics or order status apps
- B. Applications where JSON is a good choice of storage format
- C. Scenarios where complex transaction support is required
- D. Applications requiring high OPS, such as logging apps
Answer: A,C,D
NEW QUESTION 58
Which of the following statements describe the trace/D and spanID in a service tracking system (such as Zipkin) correctly? (Number of correct answers: 3)
- A. When the user's request enters the system, a globally unique traceld will be generated on the first layer of the calling network.
- B. Traceld is used to distinguish the sequence of calls between different services of the system, spanld is used to concatenate all the paths that a certain request traverses in the system.
- C. The tracelD will be called with each layer and passed back continuously, so through traceld, the path of a user request in the system can be connected in series.
- D. Spanld can locate the position of a request in the system call, and who its upstream and downstream dependencies are respectively.
Answer: A,B,D
NEW QUESTION 59
Which of the following is NOT a valid state for a scaling activity in Alibaba Cloud's Elastic Scaling Service ESS -also known as Auto Scaling) state of the scaling activity in the Alibaba Cloud elastic scaling group?
- A. Rejected
- B. Timeout
- C. Failed
- D. Executing
Answer: C
NEW QUESTION 60
Company A has a large number of files store in Alibaba Cloud OSS that need to be deleted (numbering in the tens of thousands). What is the fastest, easiest way to delete these files?
- A. Call the API from a script, deleting files in batches
- B. Manually delete them one by one
- C. Directly delete the bucket
- D. Configure a life cycle rule that matches the entire bucket, and delete all files after one day
Answer: B
NEW QUESTION 61
Which of the following operations can be performed through Log Service sAPI? (Number of correct answers:
3)
- A. Access control for different users
- B. Collect logs based on Logtail configuration and Logtail machine group information
- C. Create a Logstore, write and read logs to the Logstore
- D. Deliver logs to OSS for storage and analysis
Answer: A,B,C
NEW QUESTION 62
Which of the following data volume types is not supported by Elastic Container Instance (ECI)?
- A. FixedVolume
- B. EmptyDir
- C. NFS
- D. ConfigFile
Answer: B
NEW QUESTION 63
To meet data analytics requirements on large datasets, which of these databases can meet the demand for structured and semi-structured storage for almost all types of data, albeit with limited support for strong transactions?
- A. TSDB
- B. HBase
- C. RDSMariaDB
- D. OceanBase
Answer: C
NEW QUESTION 64
A development team currently supports an application that is designed to be deployed on a single server's local memory As part of migrating to Alibaba Cloud, the team needs to use Auto Scaling, and must therefore move their game state data off of their servers, so that they can automatically scale up and down without losing game data. Where should the team store these game results to best allow for consistent results without impacting performance?
- A. OSS
- B. Log Service
- C. Redis
- D. RDS
Answer: C
NEW QUESTION 65
Which of the following descriptions of Alibaba Cloud's SSL certificate service are correct? (Number of correct answers: 2)
- A. EV certificates are suitable for large enterprises, financial institutions, etc.
- B. OV certificates are suitable for personal websites.
- C. Alibaba Cloud SSL Certificate Service supports the purchase of three types of certificates: DV certificates, OV certificates, and EV certificates.
- D. DV level certificates are suitable for government organizations, enterprises, educational institutions, etc.
Answer: B,C
NEW QUESTION 66
CloudMonitor's "Event Monitoring" feature provides you with event reporting, query, and alarm functions, Score 2 so that you can collect metrics on your running Alibaba Cloud systems, and receive alerts when something goes wrong. Which of these is NOT a correct description of the monitoring event types supported by CloudMonitor?
- A. For ECS, CloudMonitor supports the collection and reporting of important ECS operating system level events, such as application crashes.
- B. For Server Load Balancer (SLB), CloudMonitor supports the collection and reporting of HTTPS certificate expiration events, for certificates installed on SLB.
- C. For E-MapReduce, CloudMonitor supports the collection and reporting of service component status, cluster creation failure, and timeout events.
- D. For Object Storage Service (OSS), CloudMonitor supports the collection and reporting of bucket upstream and downstream bandwidth which exceeds the flow control threshold or the user-selected reporting threshold.
Answer: B
NEW QUESTION 67
When connecting to the Alibaba Cloud RDS database, in order to improve the completeness and integrity of the connection, you can enable SSL encryption and install an SSL CA certificate for the required application service. Which of the following statements are correct? (Number of correct answers: 3)
- A. When using read/write splitting, you can also enable SSL encryption to improve the security of the connection.
- B. It is discovered that an Alibaba Cloud RDS SSL certificate is about to expire, and the validity period needs to be updated, requiring that the certificate be updated, then reinstalled. This will restart the RDS instance.
- C. Due to the way in which SSL encryption is implemented, enabling SSL encryption will significantly increase the CPU usage rate. Enable SSL encryption when there is an encryption requirement for the external network link. The intranet link is relatively safe, and generally no link encryption is required.
- D. If the RDS instance is a multi-node instance, the system will trigger the active/standby switch after the SSL service is disabled.
Answer: A,C,D
NEW QUESTION 68
When a developer calls the Alibaba Cloud SDK to access Elastic Compute Service (ECS), the following error is returned; RealNameAuthenticationError What is the possible cause?
- A. The API callers account and password are not authorized for ECS access.
- B. The user's Alibaba Cloud account has not passed real name authentication
- C. The ECS instance name violates the ECS service's naming conventions.
- D. The ECS instance name conflicts with other instance names.
Answer: A
NEW QUESTION 69
Assume that a company uses ApsaraDB for PolarDB. The company commonly queries users based on their basic information, including: addresses, company names, and ID numbers. In this scenario, what is the best practice for creating a database index (or indexes)?
- A. Create a hash index on each column to be searched.
- B. Create a b-tree index on each column to be searched.
- C. Create a gist index for multiple fields.
- D. Create a gin index for multiple fields.
Answer: B
NEW QUESTION 70
Which
of the following parameter locations should be specified for the parameter of key1 where the request URL is in the form: http://somesite.com/test?key1 =[value1] ?
- A. HTTP Body
- B. HTTP Header
- C. Query
- D. Parameter Path
Answer: D
NEW QUESTION 71
Which of the following options describes the basic concepts of Alibaba Cloud Tracing Analysis correctly?
(Number of correct answers: 3)
- A. In the OpenTracing standard, each Span represents a named and timed non-continuous execution segment in the call chain
- B. In the OpenTracing standard, a call chain can be regarded as a directed acyclic graph (DAG) composed of multiple Spans. The relationship between spans is named References
- C. Alibaba Cloud Tracing Analysis model relies on OpenTracing
- D. In some cases, timing diagrams based on the timeline are used to show the call chain
Answer: A,B,C
NEW QUESTION 72
Which of the following programming languages are supported by the Alibaba Cloud SDK? (Number of correct answers: 3)
- A. PHP
- B. Swift
- C. Bash shell
- D. Java
- E. Python
Answer: A,D,E
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/74712.htm
NEW QUESTION 73
The event monitoring feature in CIoudMonitor provides custom event monitoring functions. Which of the following data reporting methods are included? (Number of correct answers: 3)
- A. Report event monitoring through the Java SDK
- B. Report event monitoring data through the command line (CU)
- C. Report event monitoring data via HTTP
- D. Report event monitoring through the Python SDK
Answer: A,C,D
NEW QUESTION 74
Which of the following descriptions of the principles of Alibaba Cloud SSL certificate private key protection is correct?
- A. The plaintext of Alibaba Cloud's private key is usually stored on disk and backed up regularly
- B. Alibaba Cloud Certificate Service keys are loaded Into memory in plaintext format ONLY when needed
- C. Alibaba Cloud Certificate Service uses symmetric encryption to save the certificate private key
- D. Alibaba Cloud uses the built-in functionality of the SSL certificate service to encrypt and store the private key to certificates private key
Answer: A
NEW QUESTION 75
A certain project of Enterprise A (called Project-X) moves to the cloud and will need to use a variety of s Alibaba Cloud resources, such as ECS instances, RDS instances, SLB instances, and OSS storage space. There are multiple employees on the project who need to operate these cloud resources. Because each employee has different job responsibilities and requires different permissions, what is the WRONG approach to resource management?
- A. Use system policies to bind reasonable permissions policies to users or user groups, and customize policies for more fine-grained control
- B. Create RAM users each employee, and set login passwords or create AccessKey credentials as needed
- C. When there are multiple RAM users under a cloud account, create user groups to classify and authorize RAM users with the same responsibilities
- D. When creating RAM for users, give each user both web console AND AccessKey credentials: there is no need to keep these separate
Answer: B
NEW QUESTION 76
A mobile application developer intends to use Alibaba Cloud Object Storage Service (OSS) to store the end user data for their app, and to ensure data isolation between each user of the app, to prevent one user from obtaining another's data. Which method can be done to meet these requirements?
- A. Object Policy
- B. RAM Policy
- C. STS authorization
- D. Bucket Policy
Answer: C
NEW QUESTION 77
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