[Nov-2021 Newly Released] ACA-Developer Exam Questions For You To Pass
Alibaba Cloud ACA-Developer Exam: Basic Questions With Answers
Alibaba Cloud ACA-Developer Exam Syllabus Topics:
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NEW QUESTION 58
Which of the following descriptions of the principles of Alibaba Cloud SSL certificate private key protection is correct?
- A. Alibaba Cloud Certificate Service keys are loaded Into memory in plaintext format ONLY when needed
- B. The plaintext of Alibaba Cloud's private key is usually stored on disk and backed up regularly
- 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: B
NEW QUESTION 59
Which of the following statements are correct, with regard to Alibaba Cloud Log Service? (Number of correct answers: 3)
- A. Each log written to the Log Service backend will be saved in triplicate (across three separate physical servers)
- B. The Log Service frontend service adopts an LVS + NGINX architecture
- C. 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
- D. As an agent for collecting logs, Logtail can collect logs from existing system log files in a non-intrusive manner
Answer: A,B,C
NEW QUESTION 60
When using the Alibaba Cloud CLI, what is the default data format for responses, when executing queries such as "aliyun ecs Describelnstances"?
- A. YAML
- B. XML
- C. TABLE
- D. JSON
Answer: D
NEW QUESTION 61
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 62
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 63
If a user finds that the Content Delivery Network (CDN) cache hit rate is low, what could be the reason?
(Number of correct answers: 3)
- A. HTTP Header settings may cause cache misses.
- B. Insufficient bandwidth was selected when enabling the CDN service, causing the service capacity reach its limit too early.
- C. Cache configuration is inappropriate (ex. overly short Cache Expiry Time for popular files).
- D. The origin site has a large number of dynamic resources.
- E. When the website has low traffic, the CDN will receive fewer requests and this will result in a lower cache hit rate.
Answer: B,C,E
NEW QUESTION 64
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 65
For business scenarios with strong data reliability requirements or financial business scenarios with regulatory requirements related to data durability and availability, RDS MySQL provides a remote backup mechanism to improve reliability. Which of the following is correct, regarding RDS's remote disaster recovery capabilities?
(Number of correct answers: 3)
- A. When the database deletion operation is performed on the master instance, the operation will also be synchronized to the disaster recovery instance
- B. When an outage occurs in the area where the primary instance is located, and neither the primary instance (Master) nor the standby instance (Slave) can be connected to, the remote disaster recovery instance can be switched to the primary instance
- C. RDS realizes real-time synchronization between the master instance and the remote disaster recovery instance through Data Transmission Service (DTS)
- D. The primary database (the one to be backed up) must have an Alibaba Cloud Intranet address
Answer: A
NEW QUESTION 66
Which of the following are correct, regarding RAM users? (Number of correct answers: 3)
- A. RAM users must be authorized by the Alibaba Cloud account to log in to the console or use the API to manage the resources owned by the Alibaba Cloud account.
- B. RAM users can be created under a single Alibaba Cloud account, corresponding to employees, systems, or applications.
- C. RAM users belong to an Alibaba Cloud account, but they can also operate as independent accounts with their own private resources, not visible to the primary Alibaba Cloud account.
- D. RAM users do not "own" the resources that they create (those belong to the Alibaba Cloud account itself), and RAM users cannot generate and pay their own individual bills (costs accrue to and are billed to the master Alibaba Cloud account).
Answer: A,B,C
NEW QUESTION 67
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 E-MapReduce, CloudMonitor supports the collection and reporting of service component status, cluster creation failure, and timeout events.
- C. 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.
- D. For Server Load Balancer (SLB), CloudMonitor supports the collection and reporting of HTTPS certificate expiration events, for certificates installed on SLB.
Answer: D
NEW QUESTION 68
Log Service uses a semi-structured data model to define a log. This mode contains five data fields:
Topic, Time, Content, Source, and Tags. Log Service has different requirements for the format of each field in the log. Which of the following fields cannot be empty characters? (Number of correct answers: 4)
- A. Time
- B. Tags
- C. Source
- D. Topic
- E. Content
Answer: A,B,C,D
NEW QUESTION 69
Which of the following options correctly describes CloudMonitor Custom Monitoring and Custom Events?
(Number of correct answers; 2)
- A. Custom Monitoring is used for collection of non-continuous event data, such as information about ECS instance restarts.
- B. Custom Events is for periodic and continuous collection of time series monitoring data, queries, and alarms.
- 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: A,C
NEW QUESTION 70
What migration features does Alibaba Cloud SMC (Server Migration Center) support? (Number of correct answers: 3)
- A. Supports migration to Container Registry
- B. Supports incremental data migration
- C. Supports batch migration
- D. Supports all versions Microsoft Windows
- E. Supports migration from virtual machines to physical machines
Answer: A,B,C
NEW QUESTION 71
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. Two-way data synchronization
- B. Incremental data migration
- C. Full data migration
- D. One-way data synchronization
Answer: C
NEW QUESTION 72
A developer was sending a request to Key Management Service (KMS) through the KMSAPI interface, and found that the key management service cannot be accessed. What is a possible reason?
- A. The HTTPS protocol is not enabled
- B. The user key master key is in Pendinglmport state
- C. The user key master key is in PendingDeletion state
- D. User key master key is in Disabled state
Answer: C
NEW QUESTION 73
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 74
Which of these are good ways to secure access to your API deployed on Alibaba Cloud API Gateway?
(Number of correct answers: 3)
- A. Allow only internal IP addresses to call the API.
- B. Use OpenID Connect to authenticate requests.
- C. Configure security keys for API Gateway.
- D. Enable API Gateway to connect to backend services in an Alibaba Cloud VPC network group. This guarantees the security of API requests.
- E. Use HTTPS to encrypt requests.
Answer: A,D,E
NEW QUESTION 75
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