[Dec-2021] Alibaba Developer ACA-Developer Exam Practice Dumps
2021 ACA-Developer Premium Files Test pdf - Free Dumps Collection
NEW QUESTION 41
A developer accesses logs in a Log Service Logstore via the API. The error code returned by the server is 404.
Which of these could be the cause?
- A. Server internal error
- B. The requested digital signature does not match
- C. The log project (Project) does not exist
- D. Server is busy: please try later
Answer: C
NEW QUESTION 42
An Elastic Compute Service (ECS) instance (private IP only) needs to read data from a RDS MySQL database in another VPC through a private IP address, and at the same time, RDS's public internet endpoint needs to be available for requests from some internet clients. Which steps must be taken to allow applications to access this RDS instance via both interfaces? (Number of correct answers: 2)
- A. Connect the two VPCs through CEN.
- B. Make sure that the security group of the ECS instance allows outbound access to the MySQL service port.
- C. Add the private and public IP addresses of all applications to the RDS whitelist.
- D. Configure a NAT gateway for the VPC to which the ECS instance belongs.
Answer: D
NEW QUESTION 43
What are the advantages of using Elastic Container Instance (ECI) to deploy applications compared with using ECS? (Number of correct answers; 2)
- A. Startup in seconds without the need to reserve resources
- B. Stronger isolation between instances
- C. Low maintenance, low costs
- D. Less significant visualization layer performance losses
Answer: A,C
NEW QUESTION 44
Which of the following statements about migrating data into and out of Object Storage Service (OSS) are correct? (Number of correct answers: 3)
- A. Online migration supports both migrating buckets at a time, and migrating all the data under an Alibaba Cloud account at a single time.
- B. You cannot migrate data between OSS buckets if the data at the source is stored in a bucket of the Archive type.
- C. A migration job occupies the network resources of the source and the destination. To ensure business continuity, we recommend that you specify a rate limit for a migration Job or run the migration job during an off-peak period.
- D. You can migrate data between OSS buckets in any of the following conditions: Buckets are located within the same region, buckets are located across regions and buckets belong to different Alibaba Cloud accounts.
Answer: A,B,D
NEW QUESTION 45
In order to have your applications interact with Alibaba Cloud RabbitMQ, you need to create related MQ resources first. Which of the following resources must be created? (Number of correct answers: 3)
- A. Broker
- B. Vhost
- C. Exchange
- D. Topic
- E. Queue
Answer: C,D,E
NEW QUESTION 46
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 NFS and delete the files when the Function Compute function call completes.
- B. Copy the files to an OSS bucket with a lifecycle policy configured to delete the files automatically.
- C. Store the files in the /tmp directory on a temporary ECS instance, and delete the files at when the Function Compute function call completes.
- D. Store the files in Cloud Disk and delete the files when Function Compute function call completes.
Answer: C
NEW QUESTION 47
Which of the following programming languages are supported by the Alibaba Cloud SDK? (Number of correct answers: 3)
- A. PHP
- B. Bash shell
- C. Swift
- D. Java
- E. Python
Answer: A,D,E
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/74712.htm
NEW QUESTION 48
Which of the following web applications are suitable for deployment on Simple Application Server (SAS), as compared with LCS? (Number of correct answers: 3)
- A. Quickly build a small e-commerce website
- B. Quickly build serverless site using Function Compute
- C. Quickly build a personal, learning, or test environment
- D. Quickly build a personal blog website
- E. Set up a NoSQL database service
Answer: B,C,D
NEW QUESTION 49
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. Redis
- B. RDS
- C. OSS
- D. Log Service
Answer: A
NEW QUESTION 50
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. 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.
- B. If the RDS instance is a multi-node instance, the system will trigger the active/standby switch after the SSL service is disabled.
- C. 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.
- D. When using read/write splitting, you can also enable SSL encryption to improve the security of the connection.
Answer: A,B,D
NEW QUESTION 51
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 52
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. Alibaba Cloud SSL Certificate Service supports the purchase of three types of certificates: DV certificates, OV certificates, and EV certificates.
- C. DV level certificates are suitable for government organizations, enterprises, educational institutions, etc.
- D. OV certificates are suitable for personal websites.
Answer: B,D
NEW QUESTION 53
Which of these are suitable use cases for Alibaba Cloud's MongoDB service? (Number of correct answers: 3)
- A. Applications requiring high OPS, such as logging apps
- B. Scenarios where complex transaction support is required
- C. Applications requiring geo-location queries, such as logistics or order status apps
- D. Applications where JSON is a good choice of storage format
Answer: A,B,C
NEW QUESTION 54
By default, Function Compute creates an instance for each request Function compute allows you to create multiple instances concurrently to reduce costs and improve execution efficiency Which of the following scenarios is NOT suitable for enabling the feature of handling multiple requests on a single instance? (Number of correct answers: 2)
- A. Requests are waiting for responses from the downstream service for an extended period of time.
- B. Functions processes independent data objects.
- C. A request consumes a large amount of CPU and memory resources.
- D. The function has a shared state and cannot be accessed concurrently.
Answer: A,D
NEW QUESTION 55
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. Event Notifications can cross regions.
- B. The consumer type of the event notification message can be HTTP Server, Queue, or Topic.
- C. 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.
- D. Message Service provides synchronous notifications to ensure the consistency between the message acknowledgment and event processing.
Answer: C,D
NEW QUESTION 56
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. Configure a life cycle rule that matches the entire bucket, and delete all files after one day
- B. Directly delete the bucket
- C. Manually delete them one by one
- D. Call the API from a script, deleting files in batches
Answer: C
NEW QUESTION 57
Which of the following is NOT required for SMC (Server Migration Center) to migrate a server to Alibaba Cloud?
- A. From the SMC console, configure the type of disk image to be generated during the migration.
- B. The SMC client transfers the source data to an intermediate ECS instance.
- C. Import the migration source information to the SMC console.
- D. The SMC backend service generates a target Alibaba Cloud image based on the migration source.
Answer: C
NEW QUESTION 58
Which of the following options describes the basic concepts of Alibaba Cloud Tracing Analysis correctly?
(Number of correct answers: 3)
- A. Alibaba Cloud Tracing Analysis model relies on OpenTracing
- B. In the OpenTracing standard, each Span represents a named and timed non-continuous execution segment in the call chain
- C. In some cases, timing diagrams based on the timeline are used to show the call chain
- D. 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
Answer: A,B,D
NEW QUESTION 59
Which of the following is NOT a feature of Alibaba Cloud's Cassandra database service?
- A. Cluster storage, strong expansion of read and write capabilities
- B. Enterprise-level capabilities such as disaster tolerance, backup and recovery, security, and monitoring across data centers
- C. Centerless distributed architecture
- D. Supports both narrow and wide tables, providing flexible schema functions
Answer: D
NEW QUESTION 60
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