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Alibaba Cloud ACA-Developer Exam Syllabus Topics:
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NEW QUESTION 19
A Developer is asked to implement a caching layer in front of RDS. Cached content is expensive to regenerate in case of service failure. Which implementation below would work while maintaining maximum uptime?
- A. Install Redis on an ECS instance
- B. Implement ApsaraDB for Redis in Cluster Mode
- C. Migrate the ROS database to HBase to save the cache layer
- D. Implement ApsaraDB for Redis in Standard Mode
Answer: C
NEW QUESTION 20
Which of the following cloud services can be integrated with Alibaba Cloud KMS (Key Managed Service)?
(Number of correct answers: 3)
- A. Elastic Compute Service (ECS)
- B. Server Load Balancer (SLB)
- C. Object Storage Service (OSS)
- D. Relational Database Service (RDS)
Answer: A,C,D
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/141499.htm
NEW QUESTION 21
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 22
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. There is not enough space in the Logstore partition
- B. The target partition in the Logstore is not specified
- C. The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds
- D. There is significant network delay
Answer: B
NEW QUESTION 23
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 Header
- B. HTTP Body
- C. Query
- D. Parameter Path
Answer: D
NEW QUESTION 24
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 25
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 26
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 27
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 "Topic" data field is empty
- B. The log size written to log group is less than 5MB
- C. The target partition in the Logstore is not specified
- D. Insufficient space in the Logstore partition
Answer: D
NEW QUESTION 28
What are the required parameters for the Python SDK to create a client to access Alibaba Cloud's API?
(Number of correct answers: 3)
- A. access.keyjd
- B. regionjd
- C. access.key.secret
- D. vpcjd
- E. zone jd
Answer: A,B,C
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/53090.htm
NEW QUESTION 29
By default Function Compute cannot access resources within a VPC network group. To enable Function Compute to access resources located in a VPC, which of the following parameters needs to be configured?
(Number of correct answers: 3)
- A. vpcld
- B. securityGroupId
- C. vSwitchlds
- D. ENIID
Answer: A,B,C
Explanation:
Explanation
Specifies whether to allow functions to access VPC resources.
* On: Functions can access VPC resources.
If you turn on the switch, you must set the following parameters:
* VPC: Select a VPC.
* Vswitches: Select one or more vSwitches.
* Security Group: Select the security group with which your ENI is associated.
* Off: Functions cannot access VPC resources.
https://www.alibabacloud.com/help/doc-detail/72959.htm
NEW QUESTION 30
Which of the following errors may occur when you access an image stored in Object Storage Service, and attach an image processing URL parameter to the URL ? (Number of correct answers: 3)
- A. NoSuchStyle
- B. NoSuchBucket
- C. NoSuchKey
- D. NoSuchFile
- E. NoSuchObject
Answer: B,C,D
NEW QUESTION 31
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 32
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 gist index for multiple fields.
- B. Create a b-tree index on each column to be searched.
- C. Create a hash index on each column to be searched.
- D. Create a gin index for multiple fields.
Answer: B
NEW QUESTION 33
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 34
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 data via HTTP
- B. Report event monitoring through the Java SDK
- C. Report event monitoring through the Python SDK
- D. Report event monitoring data through the command line (CU)
Answer: A,B,C
NEW QUESTION 35
Function Compute supports one-way triggers and two-way triggers. Which of the following triggers is a one-way trigger? That is to say you only need to configure the trigger in the event source, not in Function Compute?.
- A. SLS trigger(s)
- B. MNS topic trigger(s)
- C. CloudMonitor trigger(s)
- D. OSS event trigger(s)
Answer: C
NEW QUESTION 36
Which of the following are types of backend services that API Gateway supports? (Number of correct answers: 3)
- A. HTTP(s) service
- B. Log service
- C. Function Compute
- D. Resources In a VPC
- E. CloudMonitor Service
Answer: A,D,E
NEW QUESTION 37
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 38
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