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NEW QUESTION 17
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: A
NEW QUESTION 18
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. JSON
- C. TABLE
- D. XML
Answer: B
NEW QUESTION 19
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 through the Java SDK
- B. Report event monitoring data via HTTP
- C. Report event monitoring through the Python SDK
- D. Report event monitoring data through the command line (CU)
Answer: A,B,C
NEW QUESTION 20
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 21
You have an application with the following requirements:
7. There will be a lot of video content that need to be uploaded.
2. Each uploaded video needs to be preprocessed to provide different video resolutions and quality levels to accommodate different devices and network conditions.
3. It should be possible to process video in parallel at scale, to ensure that videos are preprocessed in a reasonable amount of time.
Which of the following Alibaba Cloud applications can be combined to provide a low operation and maintenance burden and relatively low operating costs? (Number of correct answers: 3)
- A. Server Load Balancer (SLB)
- B. Serverless Workflow
- C. Function Compute
- D. Elastic Compute Service (ECS)
- E. Log Service
Answer: B,D,E
NEW QUESTION 22
A developer is making the ModifyDDInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)
- A. The instance has a backup task being executed
- B. No instance type (specification) was included in the request parameters
- C. The targeted RDS instance is a disaster recovery instance
- D. The instance is in the running state
Answer: A,B,D
NEW QUESTION 23
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 24
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. Table Store
- C. Function Compute
- D. Object Storage Service (OSS)
Answer: C
NEW QUESTION 25
you have a Node.js based application and you plan to migrate it to Alibaba Cloud Function Compute, which of the following steps is unnecessary?
- A. Configure program startup commands and access ports in the Function Compute console
- B. Manually install the Node. Js package in the Function Compute console
- C. Start and verify the application in the Function Compute console
- D. Create a single web application and upload the corresponding code package via the Function Compute console (or fcli)
Answer: B
NEW QUESTION 26
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. Logslash
- B. Syslog
- C. Web Tracking
- D. Kafka
Answer: B
NEW QUESTION 27
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 28
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 29
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 is busy: please try later
- B. Server internal error
- C. The requested digital signature does not match
- D. The log project (Project) does not exist
Answer: D
NEW QUESTION 30
Which of these are suitable use cases for Alibaba Cloud's MongoDB service? (Number of correct answers: 3)
- A. Applications requiring geo-location queries, such as logistics or order status apps
- B. Scenarios where complex transaction support is required
- C. Applications requiring high OPS, such as logging apps
- D. Applications where JSON is a good choice of storage format
Answer: A,B,C
NEW QUESTION 31
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 32
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 33
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 34
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 35
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 36
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. Make sure that the security group of the ECS instance allows outbound access to the MySQL service port.
- B. Configure a NAT gateway for the VPC to which the ECS instance belongs.
- C. Add the private and public IP addresses of all applications to the RDS whitelist.
- D. Connect the two VPCs through CEN.
Answer: B
NEW QUESTION 37
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 gin index for multiple fields.
- B. Create a gist index for multiple fields.
- C. Create a hash index on each column to be searched.
- D. Create a b-tree index on each column to be searched.
Answer: D
NEW QUESTION 38
A developer have written a web application using a microservice architecture, in such a architecture, the client (web browser or mobile application) first initiates a request. The request first reaches the load balancer, then goes through an authentication service, a billing service, then requests a resource, and finally a result is returned. How many spans does such a call chain consist of?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 39
Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)
- A. The STS service supports the use of both HTTP and HTTPS protocols
- B. When calling the STS API, in order to ensure the safe calling of the API, Alibaba Cloud will authenticate each API request through a signature when each API call is made
- C. A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
- D. Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud API or use the web console
Answer: A,B,C
NEW QUESTION 40
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 41
Which of the following options is not included in Object Storage Service (OSS) object URLs?
- A. Zone name
- B. Filename
- C. Region name
- D. Bucket name
Answer: C
NEW QUESTION 42
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New (2021) Alibaba Cloud ACA-Developer Exam Dumps: https://www.trainingquiz.com/ACA-Developer-practice-quiz.html
