Alibaba Cloud Elastic Compute Service (ECS) instances in different Security Groups will definitely have no way to communicate with each other.
A. True
B. False
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
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. 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.
D. In Windows, if IIS is used: after installing "F5XForwardedFor" extension module. 'Visitor's real IP" can then be seen in the log.
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. True
B. False
The daily PV volume of a community website is as high as 20 million. The applications of the website are deployed on ECS instances while logs are stored on the data disks of a single ECS instance.
Now, the website wants to extend the log retention period to 24 months and ensure that logs can be quickly downloaded when needed. The current data disks they have can only help retain three months of logs In this case, ________ is the ideal solution for solving the log retention issue.
A. CDN
B. Container Service
C. OSS
D. ApsaraDB for RDS
To meet business requirements, a user requires that the backend server of an SLB instance include a primary ECS instance and a secondary ECS instance. When the primary instance is working properly, the traffic is only forwarded to the primary ECS, when the primary instance is down, traffic is switched to the standby instance. In this case, you can create an active/standby server group on the backend of the SLB instance.
Which kind of listener supports this feature? (Number of correct answers: 2)
A. HTTPS
B. HTTP
C. UDP
D. TCP
Which of the following scenarios can be done using Alibaba Cloud Express Connection? (Number of correct answers: 2)
A. Intranet communication between VPCs and Smart Access Gateway in customers different branch offices
B. Intranet communication between a VPC and servers in an external IDC
C. Intranet communication between two VPCs in different accounts and different CIDR Blocks
D. Intranet communication between two VPCs under the same account in the same region
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. True
B. False
SLB is a load balancing service that distributes traffic to multiple cloud servers It provides a wide range of functions to meet the needs of various business scenarios If a user wants to use SLB and ECS instances to deploy two-way authenticated HTTPS websites, the following statement is correct_______.
A. SLB can only host SSL certificates, not CA certificates.
B. You need to host server SSL certificates and client CA certificates on SLB
C. SLB can only host CA certificates, not SSL certificate
D. SLB can only support HTTPS one-way authentication
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. 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.
B. 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.
C. The DNS service provider used by the domain name (such as abc.com) must support intelligent resolution.
D. The DNS service provider used by the domain name (such as abc.com) can be companies other than Alibaba Cloud.
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 request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1
B. Based on SLB's working mechanism, approximately 20% of loads will be assigned 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
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