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[2021] ACA-Cloud1 PDF Questions - Perfect Prospect To Go With ValidDumps Practice Exam
NEW QUESTION 12
A company uses Alibaba Cloud SLB and Auto Scaling at the same time, hoping this combination can help save O&M cost and provide a stable and reliable system.
However, because they do not have relevant experience, the company's engineers listed some precautions based on their understanding, and turned the list to you for advice.
As an expert of Alibaba Cloud, you tell them only _______________ is correct.
- A. All backend servers under the same SLB instance must have the same configuration
- B. SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
- C. All ECS instances under the same SLB instance must be running on the same operating system
- D. All backend servers under the same SLB instance must be in the same Scaling Group
Answer: B
Explanation:
Explanation/Reference: https://www.alibabacloud.com/blog/comprehensive-upgrade-of-alibaba-cloud-auto-scaling- product_594112
NEW QUESTION 13
Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. One of the special characteristics of OSS is its superior data reliability, because of its underlying backup technology and policies. Which of the following statement about OSS backup is correct?
- A. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.
- B. OSS leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.
- C. Customer has to safeguard their own data. OSS provides various backup interfaces to facilitate offsite backups.
- D. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.
Answer: C
NEW QUESTION 14
A large shopping mall deploys a new video surveillance system. The five-floor building in which the mall is located installed 35 HD cameras to monitor the major exits. The surveillance system is deployed on an ECS instance, which has four 2 TB data disks to store video data.
However, video data grows rapidly and the engineers find that the ECS will run out of storage space within 2 weeks.
In this case, product is thought to be the best solution for addressing the storage challenge while ensuring quick access to historical video data when needed.
- A. ECS
- B. Container Service
- C. CDN
- D. OSS
Answer: D
NEW QUESTION 15
In which of the following cases would you need to apply an ICP license? (Choose three.)
- A. Open your office in China
- B. Launch your online shop in China
- C. Accelerate your Overseas Website in China
- D. Launch your website in China
Answer: A,B,D
NEW QUESTION 16
___________ feature in Server Load Balancer means that it can forward the access requests from a single user to the same ECS instance within a certain period to ensure session continuity.
- A. least connections scheduling
- B. health check
- C. Weighted Round Robin
- D. session persistence
Answer: D
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/55202.htm
NEW QUESTION 17
Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. OSS is superior than self-built storage in all these aspects. Which of the following advantage relates to the high availability of OSS?
- A. Data has to be backed up by customer manually, which is time-consuming and labor-intensive.
- B. Data Reliability is not less than 99.99999999%. Data is backed up automatically with multiple redundant copies.
- C. Availability actually relies on the underlying hardware, which can break down easily. Once the hard disk malfunctions, it can also lead to permanent data loss.
- D. The following features are available: Multiple Authentication and Authorization mechanism, Whitelist, Anti- leech URL, and Master-Sub Account
Answer: B
NEW QUESTION 18
Company B builds a music download website based on OSS and ECS, and users can download mp3 files after registering for the website. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, engineers find that many user download requests are raised from search engine but not the website itself. In this case, which of the following measures is thought to be able to address this issue.
- A. Introduce SLB for extra protection.
- B. Limits access sources by configuring "Anti-leech settings" of OSS bucket attributes.
- C. Migrates music files from the OSS to the data disks for ECS instances.
- D. Changes the website access mode to HTTPS.
Answer: B
Explanation:
Explanation/Reference: http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNOSS11828897_en- US_intl_190202150837_public_b55986256a50380c526a35e863023ec9.pdf (55)
NEW QUESTION 19
Which of the following statements to OSS bucket is not correct?
- A. Every bucket should have a unique name
- B. There is no limitation to objects number inside one bucket
- C. Every user can create more than one bucket
- D. Bucket name can be changed after creation
Answer: D
Explanation:
Explanation/Reference: https://www.alibabacloud.com/help/doc-detail/31885.htm?spm=a2c63.p38356.a3.3.43f03bb9a3KjLl
NEW QUESTION 20
ECS is a highly flexible service. It can be used independently as a simple web server, or used with other Alibaba Cloud products, such as OSS and CDN, to provide advanced solutions. ECS can be used in applications such as: . (Choose four.)
- A. simple web applications
- B. Databases
- C. no limited online storage
- D. Official corporate websites
- E. large-traffic apps
Answer: A,B,D,E
NEW QUESTION 21
When we talk about the 'Elastic' feature for ECS product, we are not talking about.
- A. Elastic Network
- B. Elastic Storage
- C. Elastic Administration
- D. Elastic Computing
Answer: C
NEW QUESTION 22
A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. He/she sets the "Minimum number of instances" to 6 and "Maximum number of instances" to 8.
After correctly configuring scaling settings, the customer adds a scaling rule "Remove 5 ECS instances", and creates a scheduled task based on this rule.
And then, the customer checks the scaling group and see it already contains 8 valid ECS instances, he/she then enables this scaling group immediately.
How many ECS instances are left in the scaling group when the scheduled task is activated once?
- A. Five
- B. Zero
- C. One
- D. Six
Answer: B
Explanation:
Explanation
NEW QUESTION 23
Which of the following statements is true for RDS?
- A. Multiple databases can be created in one RDS instance.
- B. Databases with the same name are allowed in the same instance.
- C. None of the above is true.
- D. Resources are not shared among the databases in the same RDS instance.
Answer: A
Explanation:
Reference:
https://www.alibabacloud.com/help/doc-detail/26092.htm
NEW QUESTION 24
SQL injection is a common application layer attack, usually through building special input parameters and pass it to web applications to steal or sabotage the application dat a. Which of the following is the target for SQL injection?
- A. Web application
- B. Confidential files on the server
- C. Database
- D. Pictures on server
Answer: C
Explanation:
Reference:
https://www.rapid7.com/fundamentals/sql-injection-attacks/
NEW QUESTION 25
Which of the following statements is wrong when comparing RDS with self-built database?
- A. RDS provides automatic backup while self-built database requires you to prepare storage space for backup copies and regularly verify that these copies can be restored.
- B. RDS requires no O&M while self-built database requires a dedicated DBA for maintenance, which results in high HR cost.
- C. RDS features a high availability of 99.95% while self-built database requires you to implement data protection, primary-standby replication, and RAID all by yourself.
- D. Self-built database supports quick deployment and elastic scaling.
Answer: D
NEW QUESTION 26
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. It supports adding existing ECS instances into the scaling group, whose status however must be________.
- A. Preparing
- B. Running
- C. Stopped
- D. Created
Answer: B
NEW QUESTION 27
A/Anis a copy of data on a disk at a certain point in time.
- A. EIP
- B. snapshot
- C. image
- D. template
Answer: B
NEW QUESTION 28
Which method is not supported by OSS to create a bucket?
- A. through cloud console
- B. through ECS instance filesystem directory operation
- C. through oss cmd tool
- D. through OSS API/SDK
Answer: C
NEW QUESTION 29
Company B builds a music download website based on OSS and ECS, and users can download mp3 files after registering for the website. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, engineers find that many user download requests are raised from search engine but not the website itself. In this case, which of the following measures is thought to be able to address this issue.
- A. Introduce SLB for extra protection.
- B. Limits access sources by configuring "Anti-leech settings" of OSS bucket attributes.
- C. Migrates music files from the OSS to the data disks for ECS instances.
- D. Changes the website access mode to HTTPS.
Answer: B
Explanation:
Reference:
http://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/DNOSS11828897_en-US_intl_190202150837_public_b55986256a50380c526a35e863023ec9.pdf (55)
NEW QUESTION 30
Your friend purchases some Alibaba Cloud resources and uses them to build an online training website. Before the site goes online, your friend wants to perform some performance tests but doesn't know how to do it. In this case, which of the following services can help?
- A. Load and Performance Testing Service
- B. Support Ticket Service
- C. After-Sales Support Service
- D. None Of The Above
Answer: C
NEW QUESTION 31
Company A builds a sales management platform based on Alibaba Cloud services, using 3 ECS instances.
One of the ECS instance has MySQL installed as the database server of the platform, the other two are used as WEB servers. After some time, due to the rapid increase of employees and sales analysis requests, the performance of the platform is challenged in terms of response time. Through CloudMonitor, it is found that the average CPU usage reaches 70% for the two WEB server ECS instances and the database load reaches 75% for the database server ECS instance. In this situation, company A may choose which Alibaba Cloud services to improve the performance _________________. (Choose two.)
- A. Use content delivery network, CDN, to accelerate the caching of the platform's css, JavaScript files etc.
- B. Import data into OSS to share the storage load of the platform.
- C. By adding a SLB instance and increase the number of ECS instances to reduce the work load on current ECS instances.
- D. Use RDS to replace existing self-built database, in order to obtain better database performance; also creating RDS read-only instances to handle read-only requests, hence reduce the work load on master RDS instance.
Answer: C,D
NEW QUESTION 32
Which of the following ECS instance configurations can't be changed if we don't change instance type?
- A. Mem size
- B. Number of data disk
- C. System disk size
- D. Data disk size
Answer: C
NEW QUESTION 33
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