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Alibaba Cloud ACA-Developer Exam Syllabus Topics:
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NEW QUESTION 49
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 OSS's built in lifecycle management capabilities to move old versions of objects to Archival Storage.
- B. Avoid using version management.
- C. 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.
Answer: A
NEW QUESTION 50
Elastic Container instance (ECI) is an agile, secure, serverless service for running containers. If you need to configure public network access for ECI, which of these are reasonable solutions? (Number of correct answers: 3)
- A. Bind a NAT gateway and an EIP to the VPC to which the ECI belongs.
- B. Specify a public IP address when creating the ECI.
- C. Bind an Elastic IP (EIP) to the ECI instance.
- D. Configure ECI as a backend for a Server Load Balancer (SLB) that has a public IP address.
Answer: A,B,D
NEW QUESTION 51
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 52
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. Syslog
- B. Logslash
- C. Web Tracking
- D. Kafka
Answer: A
NEW QUESTION 53
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 54
Which of these are suitable use cases for Alibaba Cloud's ApsaraDB for Redis service? (Number of correct answers: 3)
- A. Online gaming user rankings (scoreboard)
- B. E-Commerce sales & promotions
- C. Enterprise OA system
- D. Live video chat system
Answer: A,C,D
NEW QUESTION 55
A job hunting website stores user's resumes in Object Storage Service (OSS) The current resume upload process is as follows:
7. Users upload resumes
2. The server responds to the upload request
3. The resume is uploaded to the server
4. 1 he server uploads the resume to OSS
Which of the following methods can be used to upload objects to OSS without requiring Step 3?
- A. Append Upload
- B. Simple Upload
- C. Multipart Upload
- D. Form Upload
Answer: A
NEW QUESTION 56
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 57
Which of the following detection protocol is NOT supported by CloudMonitor's Site Monitoring feature?
- A. DNS
- B. SNMP
- C. TCP/UDP
- D. HTTP(S)
Answer: B
NEW QUESTION 58
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 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
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 61
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. Spanld can locate the position of a request in the system call, and who its upstream and downstream dependencies are respectively.
- B. When the user's request enters the system, a globally unique traceld will be generated on the first layer of the calling network.
- 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 62
A game company is developing a game application for the Apple and Android platforms. Currently, this application stores user data (as flat files) securely on the local storage of a user's device. The game company wants to provide a new feature that allows customers to play the same game on different devices, which requires synchronizing user data between different devices. Which of the following cloud services supports this requirement without creating a new back-end application?
- A. Log service
- B. Function Compute
- C. Table Store
- D. Object Storage Service (OSS)
Answer: B
NEW QUESTION 63
What are the benefits of creating indexes on PolarDB? (Number of correct answers: 2)
- A. Improve the efficiency of DML operations such as UPDATE.
- B. Improve the query efficiency SELECT statements.
- C. Improve the efficiency of DDL operations.
- D. Reduce invalid data scanning.
Answer: B,D
NEW QUESTION 64
Which data format is NOT supported by Alibaba Cloud Message Service?
- A. XML
- B. VERBOSE
- C. JSON
- D. SIMPLIFIED
Answer: B
NEW QUESTION 65
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. 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.
- 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. 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.
- D. A visitor's real IP address can only be obtained by modifying the site or web application.
Answer: B,D
NEW QUESTION 66
A certain project of Enterprise A (called Project-X) moves to the cloud and will need to use a variety of s Alibaba Cloud resources, such as ECS instances, RDS instances, SLB instances, and OSS storage space. There are multiple employees on the project who need to operate these cloud resources. Because each employee has different job responsibilities and requires different permissions, what is the WRONG approach to resource management?
- A. When there are multiple RAM users under a cloud account, create user groups to classify and authorize RAM users with the same responsibilities
- B. When creating RAM for users, give each user both web console AND AccessKey credentials: there is no need to keep these separate
- C. Create RAM users each employee, and set login passwords or create AccessKey credentials as needed
- D. Use system policies to bind reasonable permissions policies to users or user groups, and customize policies for more fine-grained control
Answer: C
NEW QUESTION 67
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 68
Which of the following statements about PolarDB's endpoint(s) is NOT correct?
- A. The endpoint of the PolarDB MySQL database includes the cluster endpoint and the primary endpoint.
- B. Cluster endpoints support read/write splitting.
- C. The primary endpoint supports read/write splitting.
- D. Through a cluster endpoint, applications can connect to data nodes.
Answer: B
NEW QUESTION 69
Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)
- A. aliyun-cll
- B. DMS (Data Management Service)
- C. Sentinel
- D. Redis-cIl
Answer: C,D
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
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 72
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 73
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