Use Real ACA-Developer - 100% Cover Real Exam Questions [Dec-2021]
Dumps Brief Outline Of The ACA-Developer Exam - TestPassKing
NEW QUESTION 48
A developer creates a MySQL database service on a Linux ECS instance (ECS-A), and wants to access this database service from another instance (ECS-B) in the same VPC using the private IP address bound to the ECS instance, however, the connection can't be established. What could cause this? (Number of correct answers: 2)
- A. The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.
- B. The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.
- C. The security group for ECS-A does not have the default MySQL service port open.
- D. No Internet IP address is configured for ECS-A.
Answer: B,D
NEW QUESTION 49
Which of the following statements about PolarDB's endpoint(s) is NOT correct?
- A. Cluster endpoints support read/write splitting.
- B. The endpoint of the PolarDB MySQL database includes the cluster endpoint and the primary endpoint.
- C. The primary endpoint supports read/write splitting.
- D. Through a cluster endpoint, applications can connect to data nodes.
Answer: A
NEW QUESTION 50
Serverless Workflow allows you to orchestrate distributed tasks in sequence, branch, and parallel modes, and ensure that tasks are reliably coordinated according to your workflow logic. Which of the following service integration modes is not supported by Serverless Workflow?
- A. Waiting for callback mode
- B. Synchronization mode
- C. Asynchronous mode
- D. Request response mode
Answer: B
NEW QUESTION 51
When a developer uses the LogGroup function to package multiple logs and writes data through the API/SDK of the Log Service, it receives error code 403 or 500 continiously. What are the possible reasons?
- A. The log size written to log group is less than 5MB
- B. Insufficient space in the Logstore partition
- C. The "Topic" data field is empty
- D. The target partition in the Logstore is not specified
Answer: B
NEW QUESTION 52
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. If the RDS instance is a multi-node instance, the system will trigger the active/standby switch after the SSL service is disabled.
- B. When using read/write splitting, you can also enable SSL encryption to improve the security of the connection.
- 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. 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.
Answer: A,B,D
NEW QUESTION 53
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. Incremental data migration
- B. Full data migration
- C. One-way data synchronization
- D. Two-way data synchronization
Answer: B
NEW QUESTION 54
What are the advantages of using Elastic Container Instance (ECI) to deploy applications compared with using ECS? (Number of correct answers; 2)
- A. Stronger isolation between instances
- B. Low maintenance, low costs
- C. Less significant visualization layer performance losses
- D. Startup in seconds without the need to reserve resources
Answer: B,D
NEW QUESTION 55
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. Parameter Path
- B. HTTP Body
- C. HTTP Header
- D. Query
Answer: A
NEW QUESTION 56
Which of the following programming languages are supported by the Alibaba Cloud SDK? (Number of correct answers: 3)
- A. Bash shell
- B. PHP
- C. Swift
- D. Python
- E. Java
Answer: B,D,E
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/74712.htm
NEW QUESTION 57
Which of the following features are unique to Alibaba Cloud Container Registry, as compared with Docker Hub? (Number of correct answers: 2)
- A. You can set your image repository access to public or private.
- B. Container Registry can automatically build new Docker images when source code changes.
- C. For source code hosted on websites outside China, Container Registry can use servers outside China to build Docker images, even when you are using a Container Registry instance in Mainland China.
- D. You can create and delete image repositories in different regions based on your needs.
Answer: A,C
NEW QUESTION 58
Which of the following options correctly describes CloudMonitor Custom Monitoring and Custom Events?
(Number of correct answers; 2)
- A. Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms.
- B. Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts.
- C. Custom Monitoring is used for periodic and continuous collection of time series monitoring data, queries, and alarms.
- D. Custom Events are used for collection of continuous event type data, queries, and alarms.
Answer: B,C
NEW QUESTION 59
Which of the following statements describes AKs (Access Keys) incorrectly?
- A. You can use AK to construct an API request and the corresponding resources can be manipulated if your request successfully..
- B. An AccessKey ID and AccessKey Secret cannot be used separately
- C. AccessKey Secrets for RAM sub-accounts can be queried at any time on the Console Interface after creation
- D. AK can refer to both the AccessKey ID and the AccessKey secret
Answer: D
NEW QUESTION 60
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. Bucket Policy
- B. Object Policy
- C. ACL
- D. IntranetAccess
- E. STS authorization
- F. RAM Policy
- G. Dynamic blacklist
Answer: A,B,C,E
NEW QUESTION 61
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 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.
- B. Event Notifications can cross regions.
- C. The consumer type of the event notification message can be HTTP Server, Queue, or Topic.
- D. Message Service provides synchronous notifications to ensure the consistency between the message acknowledgment and event processing.
Answer: A,D
NEW QUESTION 62
On which operating systems can you install Alibaba Cloud command line tools? (Number of correct answers:
3)
- A. Android
- B. macOS
- C. Linux
- D. Windows
Answer: B,C,D
Explanation:
Explanation
https://www.alibabacloud.com/blog/how-to-manage-your-alibaba-cloud-linux-server-from-the-command-line-in
NEW QUESTION 63
Alibaba Cloud's ECS disk snapshotting tool can create crash-consistent snapshots for all types of Cloud Disks.
It is a convenient and efficient disaster recovery method. It is often used for data backup, custom mirroring, application disaster recovery, etc. Which of the following is NOT a correct description of disk snapshots?
- A. A snapshot is a backup file of the cloud disk data state at a certain point in time. The first snapshot of the cloud disk is a full snapshot of the ac usage. Empty data blocks are not backed up. All subsequent snapshots are incremental snapshots, and only changed data blocks are stored.
- B. Snapshots can be created manually through the web console or command line tools, or automatically according to a schedule.
- C. In the event of a system failure, you can use a snapshot to roll back the Cloud Disk to an earlier point in time.
- D. Snapshot rollbacks can be performed while the ECS instance is running.
Answer: A
NEW QUESTION 64
Alibaba Cloud Link Tracing Analysis supports call link reporting based on the Open Tracing standard. Which of the following client types does link tracing support? (Number of correct answers:3)
- A. Zipkln
- B. Pinpoint
- C. Skywalklng
- D. Jaeger
Answer: D
Explanation:
Explanation
https://www.alibabacloud.com/blog/opentracing-implementation-of-jaeger_594957
NEW QUESTION 65
Which of the following statements are correct, with regard to Alibaba Cloud Log Service? (Number of correct answers: 3)
- A. The Log Service frontend service adopts an LVS + NGINX architecture
- B. The Logstore backend service is deployed on a single machine to complete the real-time persistence, indexing, query and delivery of Logstore data to MaxCompute
- C. As an agent for collecting logs, Logtail can collect logs from existing system log files in a non-intrusive manner
- D. Each log written to the Log Service backend will be saved in triplicate (across three separate physical servers)
Answer: A,B,D
NEW QUESTION 66
Which of the following options is correct, regarding Object ACL in Alibaba Cloud's Object Storage Service (OSS)?
- A. You can set the ACL associated with an object by examining the X-OSS-Object-ACL header in the HEAD request, when making the PutObjectACL API call.
- B. If the permissions of an object are not set, the permissions of the object are inherited from the bucket.
- C. "Private" indicates that an object is a private resource, that is, only the owner of the object has read and write permissions on the object, and other users can read but have no permission to modify or delete the object.
- D. Object ACL is an object-level (not bucket level) permission control mechanism. There are currently three levels of access rights: private, public-read, and public-read-write.
Answer: D
NEW QUESTION 67
When using Alibaba Cloud CDN, a visitor's request will first be routed to a CDN edge node, and in the event of a cache miss at this edge node, the node will fetch data from the origin site (back-to-source request). Even with this redirection, it is possible for the origin site to see the visitors real IP address. Which of the following statements about obtaining the visitor's real IP address are correct? (Number of correct answers: 2)
- A. A visitor's real IP address can only be obtained by modifying the site or web application.
- B. In Windows, if IIS is used, after installing the "F5XForwardedFor" extension module, the visitor's real IP address can be seen via IIS logs.
- C. You can activate the "record visitor's real IP" function in the Alibaba Cloud CDN console, then you can directly view visitor's IP addresses from the Alibaba Cloud CDN access logs.
- D. A visitor's real IP address is stored in the "X-Forwarded-For" HTTP header It can be directly obtained via Apache or NGINX logs.
Answer: A,B
NEW QUESTION 68
Which of these are good ways to secure access to your API deployed on Alibaba Cloud API Gateway?
(Number of correct answers: 3)
- A. Enable API Gateway to connect to backend services in an Alibaba Cloud VPC network group. This guarantees the security of API requests.
- B. Use OpenID Connect to authenticate requests.
- C. Allow only internal IP addresses to call the API.
- D. Configure security keys for API Gateway.
- E. Use HTTPS to encrypt requests.
Answer: A,C,E
NEW QUESTION 69
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 70
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. Avoid using version management.
- B. 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. - C. Use OSS's built in lifecycle management capabilities to move old versions of objects to Archival Storage.
Answer: C
NEW QUESTION 71
Alibaba Cloud Log Service is a Pay-As-You-Go service. The billing unit is 7 day, and the configuration can be adjusted at any time: fees are charged according to actual usage. Which of the following are the main charges for Log Service? (Number of correct answers: 3)
- A. Storage capacity
- B. Index traffic after index configuration
- C. Read and write traffic
- D. Query analysis
Answer: A,B,C
NEW QUESTION 72
Which of the following options describes the basic concepts of Alibaba Cloud Tracing Analysis correctly?
(Number of correct answers: 3)
- A. In some cases, timing diagrams based on the timeline are used to show the call chain
- B. In the OpenTracing standard, each Span represents a named and timed non-continuous execution segment in the call chain
- C. 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
- D. Alibaba Cloud Tracing Analysis model relies on OpenTracing
Answer: B,C,D
NEW QUESTION 73
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