Ultimate Guide to Prepare ACA-Developer Certification Exam for Alibaba Developer in 2021
Use Real ACA-Developer Dumps - Alibaba Cloud Correct Answers updated on 2021
NEW QUESTION 51
You can create an event notification rule in Message Service and push notifications to the specified consumer in the form of messages, to receive events from specified Alibaba Cloud resources. Which of the following options are correct statements about the Message Service (MS) service? (Number of correct answers: 2)
- A. The consumer type of the event notification message can be HTTP Server, Queue, or Topic.
- B. Event Notifications can cross regions.
- C. Message Service provides synchronous notifications to ensure the consistency between the message acknowledgment and event processing.
- D. The event notification message is retained within the valid time. When you fail to receive an event message, the event notification message is retried based on the specified retry policy.
Answer: C,D
NEW QUESTION 52
As more businesses move online and collect more data about their users, databases are beginning to grow very large, affecting table query performance and business operations. In order to solve these problems, in addition to sub-database sub-table transformation, we can also use Data Management Service (DMS)'s archiving function to regularly archive large table data. We can then remove the archived records from the original table to improve query performance. Which of these statements about this feature of DMS is NOT correct?
- A. The supported database types are RDS MySQL and PolarDB MySQL
- B. Before you can use this feature of DMS, you must first enable Alibaba Cloud's Database Backup Service (DBS)
- C. The user role of this operation must be 'administrator" or "DBA"
- D. Backup data can be stored In OSS
Answer: C
NEW QUESTION 53
When versioning is enabled for an OSS Bucket, previous versions of objects will be retained, using storage space and incurring additional costs. How can you save space and reduce costs, while retaining some of the benefits of object versioning?
- A. Use the Function Compute Service to regularly check for and delete old versions of objects.
C Use OSS s built in lifecycle management capabilities to automatically delete old versions of objects after a set time. - B. Avoid using version management.
- C. Use OSS's built in lifecycle management capabilities to move old versions of objects to Archival Storage.
Answer: C
NEW QUESTION 54
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. RDSMariaDB
- C. OceanBase
- D. HBase
Answer: B
NEW QUESTION 55
A company has some new content that needs to be promoted (such as new features, new activities, new games, or new articles). In order to achieve the overall promotion goal, the operating staff will select various channels for promotion (including standard HTML/HTML5 (desktop), iOS, and Android). You are using Alibaba Cloud's Log Service: in order to ascertain the effectiveness of content promotion accurately and in real time, which log collection method should you use, as a developer?
- A. Logslash
- B. Syslog
- C. Web Tracking
- D. Kafka
Answer: B
NEW QUESTION 56
Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)
- A. The STS service supports the use of both HTTP and HTTPS protocols
- B. Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud API or use the web console
- C. When calling the STS API, in order to ensure the safe calling of the API, Alibaba Cloud will authenticate each API request through a signature when each API call is made
- D. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
Answer: A,C,D
NEW QUESTION 57
You want to deploy a LAMP development environment in Alibaba Cloud's Singapore region, and you want to simultaneously bind a domain name and configure HTTPS. Which of these services can help you accomplish this quickly and easily?
- A. Elastic Compute Service (ECS)
- B. Elastic Container Instance (ECI)
- C. Simple Application Server (SAS)
- D. Alibaba Cloud Container Service for Kubernetes (ACK)
Answer: C
NEW QUESTION 58
A developer received a response code of 409 when trying to use a KMS key via the API. Given that a 409 response was returned, which of these states could the KMS key be in? (Number of correct answers: 3)
- A. Disabled
- B. Pendinglmport
- C. PendingDeletion
- D. PendingCreate
Answer: A,B,C
NEW QUESTION 59
Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)
- A. Redis-cIl
- B. DMS (Data Management Service)
- C. Sentinel
- D. aliyun-cll
Answer: A,C
NEW QUESTION 60
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. Spanld can locate the position of a request in the system call, and who its upstream and downstream dependencies are respectively.
- 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. 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.
Answer: A,B,D
NEW QUESTION 61
Which of the following permission control policies does Object Storage Service (OSS) provide for access to objects stored in a bucket? (Number of correct answers: 4)
- A. ACL
- B. STS authorization
- C. Object Policy
- D. IntranetAccess
- E. Bucket Policy
- F. Dynamic blacklist
- G. RAM Policy
Answer: A,B,C,E
NEW QUESTION 62
You can use Alibaba Cloud Data transmission service (DTS) or the open source tool Redis-shake to migrate and synchronize data from a local Redis instance to an Alibaba Cloud Redis instance. What is one feature which DTS has but Redis-shake does not?
- A. One-way data synchronization
- B. Two-way data synchronization
- C. Incremental data migration
- D. Full data migration
Answer: D
NEW QUESTION 63
During the process of backing up an RDS database, a developer found that the backup failed. What might cause this to happen?
- A. DDL operations were performed during the backup
- B. DML operations were performed during the backup
- C. The database instance is not stopped
- D. DCL operations were performed during the backup
Answer: B
NEW QUESTION 64
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. Applies indices to fields that contain many records.
- 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. Adhere to the rightmost prefix principle when using composite indexes.
Answer: A,B,C
NEW QUESTION 65
A Developer is creating a Function Compute function. This function requires around 1 GB of temporary storage for files while executing. These files will not be needed after the function is completed for a fixed period. How can this developer MOST efficiently handle the temporary files?
- A. Copy the files to an OSS bucket with a lifecycle policy configured to delete the files automatically.
- B. Store the files in the /tmp directory on a temporary ECS instance, and delete the files at when the Function Compute function call completes.
- C. Store the files in Cloud Disk and delete the files when Function Compute function call completes.
- D. Copy the files to NFS and delete the files when the Function Compute function call completes.
Answer: B
NEW QUESTION 66
Which of these are good ways to secure access to your API deployed on Alibaba Cloud API Gateway?
(Number of correct answers: 3)
- A. Configure security keys for API Gateway.
- B. Use OpenID Connect to authenticate requests.
- C. Enable API Gateway to connect to backend services in an Alibaba Cloud VPC network group. This guarantees the security of API requests.
- D. Use HTTPS to encrypt requests.
- E. Allow only internal IP addresses to call the API.
Answer: C,D,E
NEW QUESTION 67
In Alibaba Cloud RocketMQ, messages are kept for up to _____ days. We recommend configuring a monitoring service to watch the consumption status, and intervene manually when ''not consumed but to be deleted'' message alarms occur.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 68
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. RDS
- B. Log Service
- C. OSS
- D. Redis
Answer: D
NEW QUESTION 69
Which of the following are types of backend services that API Gateway supports? (Number of correct answers: 3)
- A. Resources In a VPC
- B. CloudMonitor Service
- C. Log service
- D. Function Compute
- E. HTTP(s) service
Answer: A,B,E
NEW QUESTION 70
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