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NEW QUESTION 40
Auto Scaling can automatically adjust the number of ECS instances based on user-defined scaling rules to meet service needs. If a user cannot predict service changes or does not have enough history data, he/she can still use dynamic scaling mode to automatically add/remove ECS instances based on certain CloudMonitor performance metrics (such as the CPU utilization rate)
- A. False
- B. True
Answer: B
NEW QUESTION 41
If an administrator often needs to manage multiple ECS instances in an Alibaba Cloud VPC through the Internet Which of the following solutions can meet this need at low costs and without affecting system security.
- A. Choose an ECS instance from VPC and make it as the bastion host And then, apply an EIP and bind it to this ECS instance. After that the administrator can manage other ECS instances through this bastion host.
- B. Modify the VPC Security Group policy, to allow access from the Internet.
- C. None of these answers are correct.
- D. Bind an EIP to each of the ECS instances, and Jog on to each of these ECS instances to manage them.
Answer: C
NEW QUESTION 42
After activating an Alibaba Cloud Elastic Compute Service (ECS) instance, you want to monitor the status of the ECS instance via Alibaba Cloud console. Therefore: you must activate and purchase Alibaba Cloud CloudMonitor service to meet this demand.
- A. True
- B. False
Answer: B
NEW QUESTION 43
When using Alibaba Cloud SLB, users can enable the health check function If a backend ECS instance A is running abnormally, SLB will isolate it and forward the requests to other ECS instances, and when the backend ECS instance A is back to normal, SLB will again forward requests to it.
- A. False
- B. True
Answer: B
NEW QUESTION 44
OSS supports multi-part uploading for large files, namely dividing a large file into multiple parts and uploading them in order. This function is suitable for scenarios such as uploading large files or uploading files with poor connectivity.
After completing all the multi-part uploading tasks, if you forget to invoke the "Complete Multipart Upload" interface, there will be fragment files left in OSS, occupying bucket storage space-To facilitate deleting those files, OSS provides the________function.
- A. Online batch deletion
- B. Bucket clearing
- C. OpenAPI batch deletion
- D. Fragment management
Answer: A
NEW QUESTION 45
Alibaba Cloud Content Delivery Network (CDN) is a distributed network that is built and overlaid on the bearer network Moreover it is composed of edge node server clusters distributed across different regions. It replaces the traditional data transmission mode, which is centered on Web servers. When using Alibaba Cloud CDN, a user's request wilt first reach the edge node, and then receive data from the origin site by means of back-to-source Moreover, the admin can obtain visitor's real IP on the origin site. Which of the following descriptions relate to "obtaining visitors real IP" are correct? (Number of correct answers: 2)
- A. In Windows, if IIS is used: after installing "F5XForwardedFor" extension module. 'Visitor's real IP" can then be seen in the log.
- B. You can one-step activate the "recording visitor's real IP" function in Alibaba Cloud CDN console to directly view the visitor's real IP in the access log.
- C. "Visitor's real IP" is saved in "X-Forwarded-For" header in HTTP protocol. It can be directly obtained in the user-defined LOG of Apache and Nginx.
- D. "Visitor's real IP" can only be obtained by modifying the application
Answer: A,C
NEW QUESTION 46
After stopping an Alibaba Cloud Elastic Compute Service (ECS) instance, since the ECS instance is stopped, you will not be charged for anything related to that ECS instance until you start the instance again regardless of which region the instance is located in.
- A. False
- B. True
Answer: B
NEW QUESTION 47
RDS accounts can be used to connect with the databases created on a given RDS instance. Each account can be bound with multiple databases. Yet, the read/write permissions of each database can only be assigned to one RDS account
- A. False
- B. True
Answer: B
NEW QUESTION 48
You have created two Alibaba Cloud VPCs in two different regions To establish communication between these two VPCs via the Intranet, you can________.
- A. Create a new access rule through the Security Group to enable the communication
- B. No operation is needed, as VPCs under the same account are connected through the Intranet by default
- C. Use the VRouter to create a new route table to enable the communication
- D. Use CEN to establish communication between VPCs
Answer: D
NEW QUESTION 49
Which of the following ports does RDS for MySQL listen on by default?
- A. Port 8080
- B. Port 3600
- C. Port 3060
- D. Port 3306
Answer: D
NEW QUESTION 50
Alibaba Cloud ECS provides multiple instance types to meet the needs of different business scenarios. A medium-sized enterprise user wants to use two ECS instances, one to deploy a single Tomcat service and the other one to deploy Memcache. Which of the following configurations is most recommended?
- A. Tomcat: 4 cores: 4G, Memcache: 2 cores: 16G
- B. Tomcat: 4 cores. 8G, Memcache: 2 cores: 16G
- C. Tomcat: 4 cores, 4G, Memcache: 2 cores, 8G
- D. Tomcat: 4 cores 8G. Memcache: 2 cores 8G
Answer: C
NEW QUESTION 51
When the "'Obtain the Visitor's Real IP Address" function is enabled in Alibaba Cloud SLB For layer 7 services, you can obtain the real IP addresses of visitors through the______________field in HTTP header
- A. X-Forwarded-For
- B. Etag
- C. Connection
- D. Authorization
Answer: C
NEW QUESTION 52
Many websites have suffered DDoS attacks of different volumes. Therefore, accurate understanding of DDoS attacks is critical to website security protection. Which of the following statements about DDoS attacks is the MOST accurate?
- A. The purpose of a DDoS attack is to steal confidential information.
- B. DDoS attacks primarily target databases.
- C. A DDoS attacks crack the server's logon password by means of a massive number of attempts.
- D. The main purpose of a DDoS attack is to prevent the target server from providing normal services. Currently, the DDoS attack is one of the strongest and most indefensible website attacks.
Answer: D
NEW QUESTION 53
A video company uses SLB to distribute user requests to 20 ECS instances with the same configuration to response these requests. As the Spring Festival approaches, service traffic would double during holidays (based on past experience). Thus, you use Auto Scaling to elastically adjust computing resources. Since the services is online for many years, you have historic records that can help predict the upcoming service traffic and choose the scaling mode freely. In this scenario, which of the following options are feasible and with minimum operation efforts? (Number of correct answers: 2)
- A. Healthy check mode: Ensures that all the current ECS instances in scaling groups are working correctly to meet user access requests.
- B. Cloud monitor and event-triggered task: Dynamically adds ECS instances during resource shortage and reduces ECS instances during idle hours by monitoring the CPU utilization rate and workload
- C. Scheduled task: Increases the number of ECS instances to 40 on the first day of the holidays and reduce the number to 20 after the holidays.
- D. Manual mode: Set the minimum number of instances to 40 on the first day of the holidays and change the number to 20 after the holidays.
Answer: C,D
NEW QUESTION 54
Which of the following scenarios can be done using Alibaba Cloud Express Connection? (Number of correct answers: 2)
- A. Intranet communication between a VPC and servers in an external IDC
- B. Intranet communication between VPCs and Smart Access Gateway in customers different branch offices
- C. Intranet communication between two VPCs under the same account in the same region
- D. Intranet communication between two VPCs in different accounts and different CIDR Blocks
Answer: B,D
NEW QUESTION 55
RDS provides whitelist access policies. You can set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning.
- A. False
- B. True
Answer: B
NEW QUESTION 56
When a customer uses Alibaba Cloud Object Storage Service (OSS) service and finds there exist an amount of Internet downstream traffic, he/she can use Alibaba Cloud Content Delivery Network (CDN) service to reduce the traffic cost.
Because the Internet traffic cost of CDN is lower than that of OSS, moreover, the back-to-source traffic cost from CDN to OSS is also lower than a user access to OSS directly.
- A. False
- B. True
Answer: B
NEW QUESTION 57
The backend server pool of an Alibaba Cloud SLB contains multiple ECS instances, which may have different service capacities. To exploit the different service capacities of backend ECS instances, which of the following statements is correct?
- A. Choose Weighted Round Robin mode to set higher weights to ECS instances with higher capacities The higher the weight of the backend ECS instance the higher chance that the instance will receive requests.
- B. SLB cannot assign more requests to certain ECS instances.
- C. Choose Weighted Least-Connection mode, and ECS instances with higher capacities will surely be assigned with more requests.
- D. Choose Round-Robin model and ECS instances with higher capacities will surely be assigned with more requests.
Answer: A
NEW QUESTION 58
A large enterprise wants to migrate the entire business system to Alibaba Cloud to save the overall IT procurement and O&M costs From the security aspect, the company requires that
1. Must support secured remote O&M because the administrator often takes business trips.
2. Networks between subsystems should be isolated because subsystems are independently used by different departments Which of the followings should be used together to meet the company's requirements? (Number of correct answers: 3)
- A. Use the security group function of the ECS instance, and respectively deploy ECS instances running different subsystems to independent security groups.
- B. Build an independent ECS instance as the bastion host or remote logon and O&M, and authorize the bastion host to access ECS instances running other subsystems.
- C. Enable the VPN on the bastion host (or directly use the VPN image on Alibaba Cloud Marketplace). The administrator uses VPN encrypted communication during O&M.
- D. Create multiple ECS instances in the VPC to install subsystems of different departments- Allocate only Intranet IP addresses to all ECS instances, and deploy them in the same security groups.
Answer: B,C,D
NEW QUESTION 59
You are designing a solution for a startup company, the proposed solution is like this You suggest they use ECS instances to process requests from mobile App clients, and use SLB to distribute data traffic and ensure the load across each backend ECS instance is balanced.
Moreover to deal with volatile fluctuations in business volume (page views are much higher on the weekends), you also suggest they use Auto Scaling to dynamically increase or reduce computing resources.
The company is satisfied with the solution you proposed. However, they have one concern that when removing an idle instance from the scaling group: if Auto Scaling shuts the instance down directly, the service running on that instance will be abruptly terminated, resulting in poor user experience.
In order to eliminate your customer's concern, which of the following solutions should you recommend them?
- A. Find the ECS instance that is going to be removed from the backend server pool of the SLB instance, and manually remove this instance from the backend server pool Applications running on this ECS instance will normally return results, but this instance will not be assigned with new requests.
- B. Find the ECS instance that is going to be removed from the backend server pool of the SLB instancer and automatically set the weight of this ECS instance to 0. This instance will not be assigned with new requests, and will be automatically removed from the backend server pool after existing tasks are completed.
- C. First, insert a script into the image for creating the ECS instance Second, make the script run automatically when the operating system in this ECS instances is about to shut down. This script contains the processing logic that can ensure the instance finish all the remaining tasks before shutting down.
- D. Use the Lifecycle Hook function embedded m Auto Scaling Define a suitable timeout and a web hook to do the necessary work before the instance is removed.
Answer: D
NEW QUESTION 60
Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies It supports adding an existing ECS instance into the scaling group but imposes certain requirements on instance region In this case, which of the following statements is true?
- A. The instance and the scaling group must be in the same region but not necessarily the same zone.
- B. The instance and the scaling group must be in the same region and zone.
- C. The instance and the scaling group can be in different regions and zones.
- D. Each scaling group can span up to two regions. After adding the ECS instance, the number of regions of all the ECS instances in the scaling group must be no greater than two.
Answer: A
NEW QUESTION 61
Which of the following statements is most accurate about the Data Transmission Service (DTS) database migration function?
- A. Supports warning when source and destination has some unresolved conflict found.
- B. Supports all of the above functions.
- C. Supports database schema replication between instances.
- D. Supports migrating MySQL databases from external sources.
Answer: C
NEW QUESTION 62
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