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NEW QUESTION # 43
Which of the following statements is NOT correct, when comparing RDS with a self-built database?
- A. Self-built database support quick deployment and elastic scaling.
- B. RDS provides automatic backup while self-built databases require you to prepare storage space for backup copies and regularly verify that these copies can be restored.
- C. RDS features a high availability of 99 95% while self-built databases require you to implement data protection primary-standby replication, and RAID all by yourself.
- D. RDS requires no O&M while self-built database require a dedicated DBA for maintenance, which results in high HR costs.
Answer: A
Explanation:
Explanation
The statement A is not correct, because self-built databases do not support quick deployment and elastic scaling. On the contrary, self-built databases require hardware procurement, data center hosting, and machine deployment, which can be time consuming and costly. Moreover, self-built databases have low resource utilization, as they have to accommodate peak traffic requirements, while RDS can scale elastically according to the actual demand. References: = ApsaraDB for RDS vs. Self-built Databases - Alibaba Cloud
NEW QUESTION # 44
When using Alibaba Cloud SLB to forward layer 7 (HTTP) service requests. SLB will replace the IP address in the HTTP header file to forward requests.
Therefore the source IP address that can be seen on the backend ECS instance is the IP address of SLB instead of the clients real IP address.
- A. False
- B. True
Answer: B
NEW QUESTION # 45
All RDS for MySQL backups are full backups.
- A. False
- B. True
Answer: A
Explanation:
Explanation
RDS for MySQL supports both full backups and incremental backups. A full backup is a complete backup of all data in a database. An incremental backup is a backup of only the data that has changed since the last backup. Incremental backups can reduce the backup time and storage space. You can configure the backup cycle and retention period for both types of backups in the RDS console or by using the API.
NEW QUESTION # 46
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 Cloud Monitor performance metrics (such as the CPU utilization rate)
- A. False
- B. True
Answer: B
Explanation:
Explanation
Auto Scaling is a service that automatically adjusts the number of ECS instances based on your business needs and policies. You can use Auto Scaling to cope with unpredictable or periodic workloads. Auto Scaling supports three scaling modes: scheduled, dynamic, and fixed1. Dynamic scaling mode allows you to automatically add or remove ECS instances based on CloudMonitor metrics, such as CPU utilization, memory utilization, inbound traffic, and outbound traffic2. You can configure scaling rules and scaling policies to define the conditions and actions for dynamic scaling. For example, you can set a scaling rule to add one ECS instance when the average CPU utilization of the scaling group exceeds 80% for five consecutive minutes3. Dynamic scaling mode is suitable for scenarios where you cannot predict service changes or do not have enough historical data to set a schedule4. References:
1: Auto Scaling overview - Auto Scaling - Alibaba Cloud Documentation Center1
2: Scaling modes - Auto Scaling - Alibaba Cloud Documentation Center2
3: Create a scaling rule - Auto Scaling - Alibaba Cloud Documentation Center3
4: Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud5
NEW QUESTION # 47
Alibaba Cloud provides comprehensive security protection covering networks, hosts, applications, databases, and content for on-cloud clients. Users using Alibaba Cloud services only need to focus on their own services, without the need to pay any attention to security protection issues.
- A. False
- B. True
Answer: A
Explanation:
Explanation
Alibaba Cloud provides comprehensive security protection covering networks, hosts, applications, databases, and content for on-cloud clients, but users still need to pay attention to security protection issues. Alibaba Cloud and its customers are jointly responsible for the security of customers' applications built on Alibaba Cloud. With security responsibilities shared between Alibaba Cloud and its customers, Alibaba Cloud provides a secure infrastructure to decrease the enterprise security burden of customers. As such, customers can configure and use cloud products in a secure manner, thus relieving much of the underlying security burdens while allowing customers to focus more on their core business needs. However, customers still need to follow the best practices and guidelines for cloud security, such as using strong passwords, enabling multi-factor authentication, encrypting sensitive data, applying security patches, etc. Customers also need to monitor and manage the security risks and incidents of their cloud environment using Alibaba Cloud's security products and services, such as Security Center, ActionTrail, Cloud Firewall, etc. References: Cloud Security- Alibaba Cloud, Security & Compliance Center, Shared Responsibility
NEW QUESTION # 48
When using Alibaba Cloud SLB. you can set different weights for backend ECS instances The higher the weight of a backend ECS instance the more load will be assigned to it An SLB instance has 5 ECS instances in the backend server pool, all of which are healthy Among these 5 ECS instances, the weight of ecs_inst1 is set to 100. Which of the following statements is correct?
- A. Based on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1
- B. Based on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1
- C. We do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen
- D. 100% of loads will be assigned to ecs__inst1, and the remaining 4 ECS instances will stay idle
Answer: C
Explanation:
Explanation
When using Alibaba Cloud SLB, you can set different weights for backend ECS instances. The higher the weight of a backend ECS instance, the more load will be assigned to it. However, the load distribution is not based on the absolute value of the weight, but on the proportion of the weight in the total weight of all healthy backend ECS instances. For example, if there are two healthy backend ECS instances with weights of 100 and
200 respectively, the first instance will receive 33.3% of the load, and the second instance will receive 66.7% of the load. Therefore, to determine the load distribution of the 5 ECS instances in the question, we need to know the weight settings of the remaining 4 ECS instances. Without this information, we cannot tell what would happen. The other options are incorrect because they are based on wrong assumptions or misunderstandings of the SLB weight setting mechanism.
NEW QUESTION # 49
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. None of these answers are correct.
- C. Bind an EIP to each of the ECS instances, and Jog on to each of these ECS instances to manage them.
- D. Modify the VPC Security Group policy, to allow access from the Internet.
Answer: B
NEW QUESTION # 50
When you create an Alibaba Cloud VPC. a VRouter and a route table will be created automatically. Which of the following statements is NOT correct about the route table?
- A. Each VRouter may have multiple route tables.
- B. The routing entries of the route table can not be modified manually.
- C. This route table cannot be deleted
- D. When a VPC is deleted, the corresponding route table is also deleted.
Answer: D
NEW QUESTION # 51
When creating an ECS instance in your Alibaba Cloud VPC, you must specify a VSwitch for that instance at the same time. Otherwise, you will not be able to create this ECS instance.
- A. False
- B. True
Answer: B
NEW QUESTION # 52
You would like to deploy your applications on Alibaba Cloud to meet requirements including cost reduction, improving service availability, fast deployment- and redundant backup Alibaba Cloud_________products can help meet these requirements (Number of correct answers 3)
- A. Elastic Compute Service (ECS) snapshot satisfies the needs of rapid recovery of applications and data.
- B. Reasonable selection of Regions/Zones meets the location needs of application deployment as well as the demands for redundantly backup critical business applications and data.
- C. Utilizing Content Delivery Network (CDN) can meet the demands for redundant backup.
- D. Utilizing Server Load Balancer (SLB) and ECS instances can improve data reliability.
- E. Elastic Compute Service (ECS) image achieve efficient and convenient deployment.
Answer: B,C,D
NEW QUESTION # 53
Object Storage Service (OSS) supports access logging. A bucket owner can activate access logging for their buckets in the OSS management console. When access logging is activated for bucket A, OSS automatically accesses the request logs for this bucket (in hours) and generates and writes an object to the user-specified bucket B according to certain naming rules. Which of the following
statements is true for OSS logging?
- A. Buckets A and B must be the same bucket.
- B. Buckets A and B can belong to different users.
- C. Buckets A and B can be separate buckets (or a single bucket) but they must belong to the same user
- D. Buckets A and B must be different buckets.
Answer: C
NEW QUESTION # 54
Which of the following statements is most accurate about the Data Transmission Service (DTS) database migration function?
- A. Supports all of the above functions.
- B. Supports migrating MySQL databases from external sources.
- C. Supports database schema replication between instances.
- D. Supports warning when source and destination has some unresolved conflict found.
Answer: C
NEW QUESTION # 55
As a concept stem from cloud computing, cloud storage service provides on-demand storage and data services to users through a unified interface Which of the following characteristics about cloud storage are correct?
(Number of correct answers: 4)
- A. High scalability Storage capacity can be dynamically scaled to meet the needs.
- B. Management and maintenance: To prevent emergent service termination, users need to know the underlying detail like how the data is archived in the resource pool.
- C. Transparent service: Provides the service through a single SDK
- D. Service on demand Cloud storage has a huge resources pool, users can apply for and use the resources on demand.
- E. High reliability and availability: Provides very high reliability and availability through technologies like
3 redundant copies, automatic failure recovery, etc. - F. Ultra-large scale: Data storage can reach TB or even PB level
Answer: A,D,E,F
Explanation:
Explanation
A: Management and maintenance: To prevent emergent service termination, users need to know the underlying detail like how the data is archived in the resource pool. This is incorrect because cloud storage is designed to abstract the underlying details of how the data is stored and managed from the users. Users do not need to worry about the hardware, software, or network issues that may affect the data availability or reliability. The cloud storage provider is responsible for maintaining and managing the storage infrastructure and ensuring the service continuity1.
B: Service on demand Cloud storage has a huge resources pool, users can apply for and use the resources on demand. This is correct because cloud storage is based on the cloud computing model of service on demand, which means that users can request and access the storage resources as needed, without having to purchase or provision them in advance. Cloud storage providers offer flexible pricing models that allow users to pay only for the storage they use2.
C: High reliability and availability: Provides very high reliability and availability through technologies like 3 redundant copies, automatic failure recovery, etc. This is correct because cloud storage uses various technologies and methods to ensure that the data stored in the cloud is always accessible and durable. For example, cloud storage providers typically replicate the data across multiple servers, regions, or zones to prevent data loss due to hardware failure, natural disaster, or human error. Cloud storage providers also use automatic failure recovery mechanisms to detect and repair any issues that may affect the data integrity or availability3.
D: Ultra-large scale: Data storage can reach TB or even PB level. This is correct because cloud storage can handle massive amounts of data, ranging from terabytes (TB) to petabytes (PB) or even exabytes (EB). Cloud storage providers have the infrastructure and expertise to scale up the storage capacity and performance to meet the growing data needs of users. Cloud storage can support various types of data, such as structured, unstructured, or semi-structured data, and various use cases, such as data backup, data archiving, data analytics, or data sharing.
E: Transparent service: Provides the service through a single SDK. This is incorrect because cloud storage is not a transparent service, but a service that requires users to interact with it through a specific interface or protocol. Cloud storage providers usually offer different types of storage services, such as object storage, block storage, or file storage, each with its own characteristics and features. Users need to choose the appropriate storage service for their data and use the corresponding software development kit (SDK), application programming interface (API), or command-line interface (CLI) to access and manipulate the data.
F: High scalability Storage capacity can be dynamically scaled to meet the needs. This is correct because cloud storage is highly scalable, meaning that users can increase or decrease the storage capacity according to their data needs. Cloud storage providers offer elastic storage services that can automatically adjust the storage resources based on the demand, without requiring users to manually provision or deprovision them. Cloud storage also allows users to scale the storage performance, such as throughput, latency, or bandwidth, to optimize the data access and transfer.
References: 1: What is Cloud Storage? - Cloud Storage Explained - AWS 2: What is Cloud Storage & How Does it Work? | Google Cloud 3: Cloud Storage Reliability and Availability | Cloud Storage Documentation :
What is Cloud Storage? - Definition from Techopedia : Cloud Storage Types: Object, Block, and File | IBM :
Cloud Storage Scalability | Cloud Storage Documentation
NEW QUESTION # 56
Before data communication is setup, the security groups match the security group rules one by one to query whether to allow access requests Assume that the user has created two security group rules 1 and 2 The protocol type, port range, authorization type, and authorization object of the two security group rules are the same. The difference is that Rule 1 is a denial policy, rule 2 is an allowed policy, so the following statement is correct_______ (Number of correct answers 2)
- A. If rule 1 and rule 2 have the same priority, the rule of the allowed policy takes effect first, and the rule that of the denial policy does not take effect.
- B. If rule 1 and rule 2 have different priorities, the rule with a small priority number takes effect
- C. If rule 1 and rule 2 have different priorities, the rule with a large priority number takes effect.
- D. If rule 1 and rule 2 have the same priority, the rule of the denial policy takes effect first, and the rule of the allowed policy does not take effect
Answer: B,D
NEW QUESTION # 57
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 # 58
After creating an RDS for MySQL read-only instance, which of the following CAN NOT be performed by the read-only instance in RDS management console?
- A. Intranet/Internet switchover
- B. Specification change
- C. Parameter configuration
- D. SQL log auditing
Answer: A
Explanation:
Explanation
A read-only RDS instance is a replica of the primary RDS instance that can handle read requests and increase the read capability of the database system. A read-only RDS instance inherits the network type (intranet or internet) of the primary RDS instance and cannot switch between them. Therefore, option D is the correct answer. References: Create a read-only ApsaraDB RDS for MySQL instance, Instance types for read-only ApsaraDB RDS instances
NEW QUESTION # 59
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. None of these answers are correct.
- B. Bind an EIP to each of the ECS instances, and Jog on to each of these ECS instances to manage them.
- C. Modify the VPC Security Group policy, to allow access from the Internet.
- D. 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.
Answer: D
Explanation:
Explanation
A bastion host is a special-purpose computer on a network specifically designed and configured to withstand attacks. The computer generally hosts a single application, for example a proxy server, and all other services are removed or limited to reduce the threat to the computer. It is hardened in this manner primarily due to its location and purpose, which is either on the outside of a firewall or in a demilitarized zone (DMZ) and usually involves access from untrusted networks or computers. In the context of Alibaba Cloud, a bastion host can be used to securely access and manage multiple ECS instances in a VPC through the Internet. By applying an EIP and binding it to the bastion host, the administrator can use SSH or RDP protocols to log on to the bastion host from the Internet, and then use the same protocols to access other ECS instances in the VPC through the private network. This way, the administrator can avoid exposing all the ECS instances to the Internet, which would increase the risk of attacks and incur higher costs. The bastion host can also be configured with security policies and monitoring tools to enhance the protection of the ECS instances in the VPC. References: Bastion Host, Access an ECS Instance by Using a Bastion Host
NEW QUESTION # 60
If you need to accelerate a certain domain name (such as abc.com) via Alibaba Cloud Content Delivery Network (CDN), you must add it to "CDN Domain Name List" in the CDN service. After added successfully, you will get a CNAME address A Next, you need to modify domain name resolution and direct the domain name (such as abc.com) to CNAME address A.
Which of the following is a NOT correct description of modifying domain name resolution?
- A. The DNS service provider used by the domain name (such as abc.com) can be companies other than Alibaba Cloud.
- B. The DNS service provider used by the domain name (such as abc.com) must support intelligent resolution.
- C. The CNAME address allocated to the domain name (such as abc.com) will point to an IP address. This IP address resolving mechanism is intelligently managed by Alibaba Cloud CDN system.
- D. If your domain name (such as abc.com) is transferred to Alibaba Cloud in advance, and managed by the same Alibaba Cloud account, you can perform one-step resolution modification.
Answer: D
NEW QUESTION # 61
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. 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.
- B. Use the security group function of the ECS instance, and respectively deploy ECS instances running different subsystems to independent security groups.
- C. 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.
- 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: A,C,D
NEW QUESTION # 62
A popular worldwide forum stores static resources in OSS and accelerates access using CON Users find that the speed of downloading files from the forum has been greatly improved, but uploading files is slow due to the long data transmission distance, resulting in a bad access experience In order to improve the speed of uploading files for users in this forum, so that users in different regions can have a good access experience, we recommend that the forum can________.
- A. Enable OSS static website hosting
- B. Activate OSS in different regions as file storage, and synchronize data between OSS in different regions through cross-region replication
- C. Enable the transmission acceleration service for O: Enable OSS
- D. Activate the PCDN service
Answer: B
NEW QUESTION # 63
Alibaba Cloud SLB can distribute user requests to backend ECS instances. These ECS instances must have the same specification (CPU, Memory)
- A. False
- B. True
Answer: B
NEW QUESTION # 64
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. False
- B. True
Answer: A
Explanation:
Explanation
You do not need to activate and purchase Alibaba Cloud CloudMonitor service to monitor the status of the ECS instance via Alibaba Cloud console. CloudMonitor is a service that monitors Alibaba Cloud resources and Internet applications. CloudMonitor provides a one-stop, out-of-the-box, and enterprise-class monitoring solution1. CloudMonitor collects monitor metrics of Alibaba Cloud resources and custom metrics and enables you to view and understand the usage of the cloud resources, and the health of your business2. CloudMonitor allows you to monitor the metrics of Alibaba Cloud services, detect the availability of websites hosted on ECS instances or carrier servers, and configure alert rules for specified metrics3. However, CloudMonitor is not a prerequisite for monitoring the status of the ECS instance via Alibaba Cloud console. You can monitor the status of the ECS instance via Alibaba Cloud console without activating and purchasing CloudMonitor service.
You can view the basic information, configuration, security group, and tags of the ECS instance in the console. You can also view the CPU, memory, disk, and network usage of the ECS instance in the console. You can also use the Cloud Assistant feature to run commands on the ECS instance remotely4.
NEW QUESTION # 65
When creating an ECS instance in your Alibaba Cloud VPC, you must specify a VSwitch for that instance at the same time. Otherwise, you will not be able to create this ECS instance.
- A. False
- B. True
Answer: B
Explanation:
Explanation
When creating an ECS instance in your Alibaba Cloud VPC, you must specify a VSwitch for that instance at the same time. Otherwise, you will not be able to create this ECS instance. This is true according to the Alibaba Cloud documentation on ECS1. A VSwitch is a basic network device of a VPC and is used to connect different cloud product instances deployed in a VPC2. A VSwitch defines a network segment within a VPC and allows you to specify the IP address range, network mask, and gateway for the network segment2. When you create an ECS instance, you must select a VSwitch that belongs to the same zone as the ECS instance3. If you do not specify a VSwitch, the ECS instance will not be able to communicate with other cloud product instances in the VPC or access the Internet. References: 1: Create an instance by using the provided wizard - Elastic Compute Service - Alibaba Cloud Documentation Center 2: What is a VSwitch? - Virtual Private Cloud - Alibaba Cloud Documentation Center 3: Create an instance by using the advanced wizard - Elastic Compute Service - Alibaba Cloud Documentation Center : [VPC FAQ - Virtual Private Cloud - Alibaba Cloud Documentation Center]
NEW QUESTION # 66
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. SLB cannot assign more requests to certain ECS instances.
- B. Choose Round-Robin model and ECS instances with higher capacities will surely be assigned with more requests.
- C. Choose Weighted Least-Connection mode, and ECS instances with higher capacities will surely be assigned with more requests.
- D. 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.
Answer: D
Explanation:
Explanation
Weighted Round Robin (WRR) is a load balancing mode that assigns requests to backend ECS instances based on their weights. The higher the weight of the backend ECS instance, the higher the chance that the instance will receive requests. This mode can exploit the different service capacities of backend ECS instances by setting higher weights to ECS instances with higher capacities. For example, if there are two ECS instances in the backend server pool, one with a weight of 10 and the other with a weight of 20, the ECS instance with a weight of 20 will receive twice as many requests as the ECS instance with a weight of 10.
References:
1: SLB overview - Server Load Balancer - Alibaba Cloud Documentation Center
4: Server Load Balancer - Alibaba Cloud
5: Alibaba Server Load Balancer (SLB) Course - Cloud Academy
NEW QUESTION # 67
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. 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.
- B. 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.
- C. 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.
- D. 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.
Answer: B
NEW QUESTION # 68
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