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NEW QUESTION # 90
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. "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.
- B. "Visitor's real IP" can only be obtained by modifying the application
- C. In Windows, if IIS is used: after installing "F5XForwardedFor" extension module. 'Visitor's real IP" can then be seen in the log.
- D. 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.
Answer: A,D
Explanation:
Explanation
Alibaba Cloud CDN can record the real IP address of a visitor in the HTTP header field X-Forwarded-For, which can be obtained by the origin server or the user-defined log of Apache and Nginx. Alibaba Cloud CDN also provides a one-click function to enable the recording of the visitor's real IP address in the console, which can be viewed in the access log. References:
Obtain the real IP address of a client from the origin server - Dynamic Content Delivery Network - Alibaba Cloud Documentation Center1 Welcome to Alibaba Cloud and find out more detail about cdn real ip2
NEW QUESTION # 91
Many of Alibaba Cloud services provide highly reliable data storage capacity. For example, Object Storage Service (OSS) promises that its data reliability is no less than 99 99999999%. This high data reliability is solely achieved by RAID 0+1 redundancy technology.
- A. True
- B. False
Answer: B
Explanation:
Alibaba Cloud Object Storage Service (OSS) does not solely rely on RAID 0+1 redundancy technology to achieve high data reliability. OSS uses a distributed system architecture to store data across multiple devices and servers. OSS also supports cross-region replication (CRR) to replicate data across different regions for disaster recovery. OSS is designed for 99.9999999999% (12 9's) data durability and 99.995% service availability12. References:
* Object Storage Service (OSS) - Alibaba Cloud
* What is OSS? - Object Storage Service - Alibaba Cloud Documentation Center
NEW QUESTION # 92
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. Connection
- B. Authorization
- C. Etag
- D. X-Forwarded-For
Answer: D
Explanation:
Explanation
The X-Forwarded-For field in HTTP header is used to identify the originating IP address of a client connecting to a web server through an HTTP proxy or a load balancer. When the "Obtain the Visitor's Real IP Address" function is enabled in Alibaba Cloud SLB, the SLB instance adds the X-Forwarded-For field to the HTTP header of each request and forwards the request to the backend server. The backend server can then obtain the real IP address of the visitor from the X-Forwarded-For field1. The format of the X-Forwarded-For field is as follows:
X-Forwarded-For: client, proxy1, proxy2
where the value is a comma+space separated list of IP addresses, the left-most being the original client, and each successive proxy that passed the request adding the IP address where it received the request from. In this example, the request passed through proxy1, proxy2, and then the SLB instance (proxy3).2 References: Obtain client IP addresses - Server Load Balancer - Alibaba Cloud, X-Forwarded-For - MDN Web Docs
NEW QUESTION # 93
Object Storage Service (OSS) supports sub accounts, and you can allocate access permissions to different buckets for each sub account.
- A. True
- B. False
Answer: B
NEW QUESTION # 94
In Auto Scaling, a scaling group refers to the collection of ECS instances deployed with the same applications, where these ECS instances can be charged by monthly subscription or Pay-As-You-Go. For scenarios with abrupt service traffic change, Pay-As-You-Go ECS instances can meet service requirements while minimizing cost. For monthly subscription ECS instances, you can manually add the idle instances to the scaling group to take full advantage of idle resources.
- A. False
- B. True
Answer: B
Explanation:
Auto Scaling in Alibaba Cloud supports both Pay-As-You-Go and monthly subscription ECS instances within a scaling group. Pay-As-You-Go instances provide flexibility during traffic surges, while idle monthly subscription instances can be added manually to optimize costs and resource usage.
NEW QUESTION # 95
All RDS for MySQL backups are full backups.
- A. False
- B. True
Answer: B
NEW QUESTION # 96
Alibaba Cloud SLB can distribute user requests to backend ECS instances. These ECS instances must have the same specification (CPU, Memory)
- A. True
- B. False
Answer: B
Explanation:
Alibaba Cloud SLB can distribute user requests to backend ECS instances, but these ECS instances do not have to have the same specification (CPU, Memory). SLB virtualizes the added group of ECS instances in the same region into an application pool, and you can manage backend servers through either the default server group, a primary server group, or VServer groups. You can add ECS instances of different specifications to the same server group or VServer group according to your needs. SLB supports weighted round-robin (WRR) and weighted least connections (WLC) algorithms to balance the load among backend servers with different weights. References:
* SLB overview - Alibaba Cloud
* Backend server overview - Alibaba Cloud
* What is Server Load Balancer and How It Works - Alibaba Cloud
* Server Load Balancer - Alibaba Cloud
* Alibaba Server Load Balancer (SLB) Course - Cloud Academy
NEW QUESTION # 97
Once ECS is created, you can't change its private IP address anymore.
- A. True
- B. False
Answer: B
Explanation:
Explanation
You can change the private IP address of an ECS instance after it is created, but you need to stop the instance first. The private IP address must be within the CIDR block of the VPC and the VSwitch that the instance belongs to. You can modify the private IP address of an instance by using the console or the API.
References: 3, ACP Cloud Computing Certification - Alibaba Cloud Academy After stopping an Alibaba Cloud Elastic Compute Service (ECS) instance, you will still be charged for some resources related to that ECS instance, such as disks, snapshots, and public IP addresses, until you release them. The charging policy depends on the billing method and network type of the ECS instance. For pay-as-you-go instances, you can choose whether to enable the No fees for stopped instances feature, which allows you to stop paying for vCPUs and memory when the instance is stopped. However, this feature is only available for VPC-connected instances in some regions1. For subscription instances, you will be charged for the entire subscription period regardless of whether the instance is running or stopped2. References:
1: Billing FAQ - Elastic Compute Service - Alibaba Cloud Documentation Center1
2: Billing overview - Elastic Compute Service - Alibaba Cloud Documentation Center2
NEW QUESTION # 98
Company A constructed a sales management platform using three Elastic Compute Service (ECS) instances. One of the instances runs MySQL, and is used as the database server. The other two instances are used as Web servers After some time, the number of employees in Company A dramatically increases, leading to higher sales volumes At the same time, the platform response speed is gradually decreasing too.
According to the report from CloudMonitor, the average CPU utilization rate of the two Web servers exceeds 70%, and database load
reaches 75% Company A can select Alibaba Cloud_________ services.to cope with the issue and optimize the performance. (Number of correct answers: 2)
- A. Replace the self-built MySQL database with ApsaraDB for RDS to obtain better database performance, and utilize RDS read-only instances to handle read-only requests
- B. Import database data into Object Storage Service (OSS) to share the storage pressure on the platform
- C. Use Content Delivery Network (CDN) to enhance content loading speed
- D. Incorporate Server Load Balancer (SLB) and add additional ECS instances to relieve the load on existing ECS instances
Answer: A,D
NEW QUESTION # 99
An Alibaba Cloud RDS read-only instance has its data synchronized from the master instance. Which of the following can be performed by the read-only instance from the RDS management console?
- A. Account authorization and account password changing
- B. Backup policy configuration and manual backup
- C. Database creation or deletion
- D. Editing its own whitelist
Answer: D
Explanation:
In Alibaba Cloud RDS, read-only instances are synchronized from the master instance but do not allow actions such as creating or deleting databases, configuring backup policies, or changing account authorizations. However, you can configure the read-only instance's whitelist to control access.
NEW QUESTION # 100
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
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 # 101
There are two types of Alibaba Cloud SLB: private network SLB and public network SLB. You can freely choose between private network SLB and public network SLB based on your business scenarios. Alibaba Cloud will assign a private or public IP address to your SLB according to your choice.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Alibaba Cloud SLB allows users to select between private and public SLB based on business needs. A public SLB provides a public IP address for Internet-facing applications, while a private SLB provides a private IP address for internal applications within a VPC. Alibaba Cloud assigns the appropriate IP type automatically based on the user's selection of SLB type.
NEW QUESTION # 102
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 different priorities, the rule with a large priority number takes 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 the same priority, the rule of the denial policy takes effect first, and the rule of the allowed policy does not take effect
- D. 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.
Answer: B,C
Explanation:
Explanation
Before data communication is set up, the security groups match the security group rules one by one to query whether to allow access requests. If the protocol type, port range, authorization type, and authorization object of two security group rules are the same, the following rules apply:
If the two rules have the same priority, the rule of the denial policy takes effect first, and the rule of the allowed policy does not take effect. This is because the security group rules follow the principle of minimum permission, which means that the most restrictive rule is applied when there is a conflict.
If the two rules have different priorities, the rule with a smaller priority number takes effect. This is because the security group rules follow the principle of priority, which means that the rule with a higher priority (lower number) is applied when there is a conflict. References: ECS Security Groups - Alibaba Fundamentals - Cloud Academy, Security group rules - Elastic Compute Service - Alibaba Cloud Documentation Center
NEW QUESTION # 103
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 # 104
Alibaba Cloud Content Delivery Network (CDN) is a distributed network that is built and overlaid on the bearer network. It is composed of edge node server clusters distributed across different regions.
The following steps ________________ are required when a user uses Alibaba Cloud CDN. (Choose two.)
- A. Refresh cache manually
- B. Add domain name into "CDN Domain Name List"
- C. Activate CDN resource monitoring
- D. Modify domain name resolution and direct it to the given CNAME
Answer: B,D
Explanation:
To use Alibaba Cloud CDN, you must add your domain to the "CDN Domain Name List" and then modify the domain's DNS settings to point to the CNAME provided by Alibaba Cloud. Manual cache refresh (option A) is optional and not a necessary step for initial setup, and while monitoring is useful, it is not required for CDN operation, so option D is also not essential.
NEW QUESTION # 105
For ECS and RDS instances under different Alibaba Cloud accounts but in the same region, which of the following statements is NOT correct for migrating self-built MySQL databases (running on ECS) to RDS?
- A. The data cannot be migrated.
- B. The data can be imported via the public network.
- C. The data can be imported by running mysqldump.
- D. The data can be imported via the Intranet
Answer: C
NEW QUESTION # 106
When forwarding layer 7 service requests using Alibaba Cloud SLB, if you have two domain names under a certain VIP, which are respectively vip.a.com and img.a.com. Now you want to activate session persistence for vip.a.com, but not for img.a.com.
To achieve this, you can select "Rewrite Cookie" mode when enabling session persistence on the console.
In this mode, you can set the cookie name in the response. Server Load Balancer will overwrite the original cookie when it discovers that a new cookie is set. The next time the client carries the new cookie to access the Server Load Balancer, the listener will distribute the request to the previously recorded backend server.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Alibaba Cloud SLB's "Rewrite Cookie" mode allows selective session persistence for specific subdomains by setting and rewriting cookies as specified. For example, you can enable session persistence on vip.a.com while leaving img.a.com without it. SLB uses the rewritten cookie to direct subsequent requests to the previously assigned backend server.
NEW QUESTION # 107
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) must support intelligent resolution.
- B. The DNS service provider used by the domain name (such as abc.com) can be companies other than Alibaba Cloud.
- 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: A
Explanation:
The DNS service provider used by the domain name (such as abc.com) does not need to support intelligent resolution, because the CNAME address allocated to the domain name will point to an IP address that is intelligently managed by Alibaba Cloud CDN system. Therefore, option C is not a correct description of modifying domain name resolution. References: What is Alibaba Cloud CDN? - CDN - Alibaba Cloud Documentation Center and Alibaba Cloud CDN
NEW QUESTION # 108
The RDS master instance and read-only instance can be in different regions.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
In Alibaba Cloud RDS, both the master and read-only instances must reside within the same region. Cross- region replication for RDS read-only instances is not supported, as RDS read replicas are designed for high availability and load balancing within a single region.
NEW QUESTION # 109
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