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質問 # 68
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. Service on demand Cloud storage has a huge resources pool, users can apply for and use the resources on demand.
- 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. High reliability and availability: Provides very high reliability and availability through technologies like
3 redundant copies, automatic failure recovery, etc. - D. High scalability Storage capacity can be dynamically scaled to meet the needs.
- E. Ultra-large scale: Data storage can reach TB or even PB level
- F. Transparent service: Provides the service through a single SDK
正解：A、C、D、E
解説：
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
質問 # 69
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
正解：A
解説：
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.
質問 # 70
In Alibaba Cloud Object Storage, users want to use graphical tools to upload and download object files.
Which tools can they use?
- A. ossbrowser
- B. ossutil
- C. osscmd
- D. ossfs
正解：A
解説：
The ossbrowser is a graphical tool provided by Alibaba Cloud for uploading and downloading files in OSS, offering an intuitive interface for managing objects. Other tools like ossutil and osscmd are command-line tools, while ossfs is used to mount OSS as a file system on Linux, not a graphical tool.
質問 # 71
If you need to make the ECS instances under three VSwitches (inside the same Alibaba Cloud VPC) unable to access each other, while not affecting other Intranet connections in this VPC, what should you do?
- A. Create three Security Groups, each containing all ECS instances under these three VSwitches. First, configure each Security Group to allow access to all CIDR Blocks. Then, configure each Security Group to forbid access to the CIDR blocks of the other two VSwitches (with this rule given higher priority than the previous rule).
- B. Create one Security Group containing all ECS instances under these three VSwitches. First, configure the Security Group to allow access to all CIDR Blocks. Then, configure the Security Group to forbid access to the CIDR blocks of the other two VSwitches (with this rule given higher priority than the previous rule).
- C. Create three Security Groups, each containing all ECS instances under these three VSwitches. First, configure each Security Group to allow access to all CIDR Blocks. Then, configure each Security Group to forbid access to the CIDR blocks of the other two VSwitches (with this rule given a lower priority than the previous rule).
- D. None of these answers are correct.
正解：A
解説：
To isolate ECS instances within different VSwitches in a VPC while allowing them to access the internet and other intranet resources, each VSwitch's instances should be in separate Security Groups. By configuring each group to allow all VPC CIDR blocks first and then restricting access to other VSwitch CIDR blocks with a higher priority rule, instances in each VSwitch are isolated without affecting the VPC's external connections.
This approach follows Alibaba Cloud's Security Group best practices and CIDR-based access control within VPC environments.
質問 # 72
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. This route table cannot be deleted
- B. Each VRouter may have multiple route tables.
- C. The routing entries of the route table can not be modified manually.
- D. When a VPC is deleted, the corresponding route table is also deleted.
正解：C
解説：
Explanation
A route table is a set of rules that determine how network traffic is routed within a VPC or between different network instances1. A VRouter is a hub that connects all VSwitches in the same VPC and enables communication between them2. When you create a VPC, a VRouter and a default route table are automatically created for the VPC1. The default route table contains system routes that are automatically generated by the system based on the network topology1. The system routes cannot be modified or deleted1.
However, you can also create custom route tables for your VPC and add custom routes to them1. Custom routes are manually configured by users to route traffic to specific destinations, such as other VPCs, VBRs, VPN Gateways, or NAT Gateways1. Custom routes can be modified or deleted as needed1. You can also associate VSwitches with different route tables to implement fine-grained routing control1.
Therefore, the statement that the routing entries of the route table can not be modified manually is not correct, as it only applies to system routes, not custom routes. The other statements are correct, as each VRouter may have multiple route tables, one default and several custom1; when a VPC is deleted, the corresponding route table is also deleted3; and the default route table cannot be deleted1. References: Route table overview - Virtual Private Cloud - Alibaba Cloud Documentation Center, VRouter overview - Virtual Private Cloud - Alibaba Cloud Documentation Center, Delete a VPC - Virtual Private Cloud - Alibaba Cloud Documentation Center
質問 # 73
Which of the following database engines are compatible with RDS? (Choose three.)
- A. MySQL
- B. PostgreSQL
- C. Sybase
- D. PPAS
- E. SQL Server
正解：A、B、E
解説：
Alibaba Cloud RDS supports several popular database engines, including MySQL, PostgreSQL, and SQL Server. PPAS (PostgreSQL Plus Advanced Server) is also supported but not Sybase, which is not available as an RDS option on Alibaba Cloud.
質問 # 74
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
正解：B
解説：
Alibaba Cloud Elastic Compute Service (ECS) instances in different security groups are isolated from each other by default, but they can communicate with each other if the security group rules allow it. A security group is a virtual firewall that controls the inbound and outbound traffic of ECS instances. You can configure security group rules to specify which IP addresses, protocols, and ports can access the ECS instances in a security group. You can also authorize other security groups to access the ECS instances in a security group, which enables cross-security group communication. References: Manage ECS instances in security groups, Security FAQ, ECS Security Groups - Alibaba Fundamentals
質問 # 75
Many cloud computing service providers support users to activate/create a cloud service through Open API.
Which of the following protocols is most not likely to be supported by these Open API?
- A. Restful
- B. PPPoE
- C. HTTP
- D. Web Service
正解：B
解説：
PPPoE stands for Point-to-Point Protocol over Ethernet, which is a network protocol that encapsulates PPP frames in Ethernet frames and allows multiple computers to share a single Internet connection. PPPoE is typically used by Internet service providers (ISPs) to provide broadband access to their customers, such as DSL or cable modem. PPPoE is not a protocol that is commonly supported by Open API for cloud computing service providers, because it is not designed for web-based communication and requires a dedicated connection between the client and the server. Open API, on the other hand, is a term that refers to a set of publicly available application programming interfaces (APIs) that allow developers to access the functionality and data of cloud computing service providers. Open API usually follows standard protocols that are widely used on the web, such as HTTP, Restful, and Web Service. HTTP stands for Hypertext Transfer Protocol, which is the foundation of data communication on the web. HTTP defines how messages are formatted and transmitted, and what actions web servers and browsers should take in response to various commands. HTTP is a stateless protocol, which means that each request is independent and does not depend on any previous requests or responses. Restful stands for Representational State Transfer, which is an architectural style for designing web services that are based on the concept of resources. Restful web services use HTTP methods (such as GET, POST, PUT, and DELETE) to perform operations on resources, and use standard formats (such as JSON or XML) to exchange data. Restful web services are stateless, scalable, and cacheable, and aim to provide a uniform interface for interacting with different types of resources. Web Service is a generic term that refers to any software service that is available over the web and uses a standardized format for communication, such as SOAP or REST. Web Service allows different applications to communicate and exchange data across different platforms and languages. Web Service can be described using a specification language, such as WSDL or OpenAPI, which defines the structure, operations, and parameters of the service.
Web Service can also be registered and discovered using a directory service, such as UDDI or Swagger.
質問 # 76
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 can be imported by running mysqldump.
- B. The data can be imported via the public network.
- C. The data can be imported via the Intranet
- D. The data cannot be migrated.
正解：D
解説：
Explanation
Data Transmission Service (DTS) is a real-time data streaming service that supports data transmission between data sources such as relational databases, NoSQL, and Big Data (OLAP). DTS supports data migration, data synchronization, and change data subscription scenarios. DTS can migrate your data to and from most of the widely used commercial and open source databases. It supports homogeneous migrations such as MySQL to MySQL, as well as heterogeneous migrations between different database platforms, such as Oracle to MySQL.
Migrations can be from on-premises databases to RDS or ECS, databases running on ECS to RDS, or vice versa, as well as from one RDS database to another RDS database. DTS also supports migrating data between RDS instances of different Alibaba Cloud accounts, as long as they are in the same region1. Therefore, the statement B. The data cannot be migrated is NOT correct for migrating self-built MySQL databases (running on ECS) to RDS. The other statements are correct, as the data can be imported via the Intranet, the public network, or by running mysqldump234. References:
1: Migrate Self-built Database to RDS - Alibaba Cloud
2: Migrating a Self-built MySQL Database to Alibaba Cloud RDS for MySQL with Minimal Downtime
- Alibaba Cloud Community
3: Migrating Data from a Self-Managed SQL Server Database on an ECS to an ApsaraDB RDS for SQL Server Database
4: Migrate data between RDS instances of different Alibaba Cloud accounts,Data Transmission Service
質問 # 77
In an Alibaba Cloud Elastic Compute Service (ECS) instance, if you subscribe to the SELINUX service in Linux, this will not affect the monitoring feature in the ECS management console.
- A. TRUE
- B. FALSE
正解：A
解説：
Enabling SELinux on an ECS instance does not interfere with Alibaba Cloud's ECS monitoring features.
SELinux is a security module that enforces mandatory access controls on Linux systems. It operates independently from the monitoring capabilities provided by the ECS console, so ECS metrics and monitoring functions remain unaffected when SELinux is enabled.
質問 # 78
SQL injection is a common attack on the application layer. It builds special input as a parameter to pass into a web application to steal or destroy the application data. Which of the following is the target that SQL injection eventually destroys or steals from?
- A. Redis database
- B. Confidential files on the server
- C. Pictures on the server
- D. Web applications
正解：D
解説：
SQL injection attacks primarily target databases by exploiting vulnerabilities in web applications. Attackers manipulate SQL queries to gain unauthorized access to the application's backend database, which may lead to data leakage or destruction. Although SQL injection affects the data stored in databases and not directly files or images on the server, the primary target remains the application layer through which the attack is conducted.
質問 # 79
Alibaba Cloud Content Delivery Network (CDN) performs content acceleration with the support of intelligent DNS resolution The following function_________is NOT included in intelligent DNS resolution.
- A. The intelligent DNS resolution can parse the same domain name into different IP addresses based on the IP of different visitors.
- B. If a user activates mirror sites in different IDCs, intelligent DNS resolution can achieve load balancing by guiding customers in different places to different mirror sites.
- C. A user request is directed to the server nearest to the customer based on location information of the pre-configured IP section.
- D. The intelligent DNS resolution supports web page content caching. A user will receive data from the origin site at first-time access, and then will be reading data from cache in subsequent requests
正解：B
質問 # 80
During a scaling activity, when Auto Scaling fails to add ECS instances into a scaling group, it will try to ensure transaction completeness and roll back the scaling activity.
For example, a scaling activity intends to create and add 20 ECS instances into the scaling group, but only 19 of them are added successfully. In this case, the entire scaling activity will be rolled back, and the 19 instances will be removed and released as well.
- A. TRUE
- B. FALSE
正解：A
解説：
Alibaba Cloud Auto Scaling ensures transaction completeness during scaling activities. If the intended number of ECS instances cannot be added to the scaling group, Auto Scaling rolls back the entire activity, releasing any partially added instances. This behavior prevents incomplete scaling activities, ensuring the scaling action either fully succeeds or is reverted entirely.
質問 # 81
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 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.
- B. The DNS service provider used by the domain name (such as abc.com) must support intelligent resolution.
- C. 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.
- D. The DNS service provider used by the domain name (such as abc.com) can be companies other than Alibaba Cloud.
正解：C
質問 # 82
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. True
- B. False
正解：A
解説：
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]
質問 # 83
In some cases, you can purchase Elastic Compute Service (ECS) instances in Pay-As-You-Go mode to meet the demands for requiring additional computing resources in a particular period of time and set an auto-release time to release these Pay-As-You-Go instances later. ___________________ is a correct description of this operation.
- A. You cannot cancel the set auto-release time of the ECS instance
- B. You can set the auto-release time of the ECS instance multiple times
- C. You can set the auto-release time of the ECS instance once
- D. You can set the auto-release time only when creating the Elastic Compute Service (ECS) instance
正解：B
解説：
Alibaba Cloud ECS allows users to set an auto-release time for Pay-As-You-Go instances, giving flexibility in handling temporary workloads without manually releasing instances. Notably, the auto-release time can be adjusted multiple times even after the instance has been created, allowing for modifications as business needs change. This feature provides a convenient way to manage costs by automatically releasing instances when they are no longer needed. However, once the auto-release time is set, it must be adjusted or canceled if changes are required.
質問 # 84
Alibaba Cloud Server Guard provides brute-force password cracking protection. Therefore, users who have activated Server Guard neither need to modify the administrator password of their ECS instances periodically nor need to set a complicated password.
- A. FALSE
- B. TRUE
正解：A
解説：
Even with Alibaba Cloud Server Guard enabled, it is still recommended to periodically change passwords and use complex passwords to improve security. Server Guard provides additional protection but is not a substitute for strong password practices.
質問 # 85
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. True
- B. False
正解：A
解説：
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]
質問 # 86
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
正解：B、D
解説：
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
質問 # 87
A challenging thing in the gaming industry is the unpredictable and fluctuating business traffic. For example,
1 ECS instance is enough to meet all business demands today; however, we may need 10 ECS instances tomorrow.
In this situation, it is difficult to predict the number of ECS instances required. If we use too few ECS instances, we may not be able to cope with business peaks; whereas if we use too many ECS instances, we may introduce unnecessary costs.
On Alibaba Cloud, _______________ is the best product portfolio to cope with the gaming scenario described above.
- A. Elastic Compute Service (ECS) + Auto Scaling
- B. Elastic Compute Service (ECS)
- C. Server Load Balancer (SLB) + Elastic Compute Service (ECS) + ApsaraDB for RDS
- D. Server Load Balancer (SLB) + Elastic Compute Service (ECS) + ApsaraDB for RDS + Auto Scaling
正解：D
解説：
In this scenario, a combination of Server Load Balancer (SLB), ECS, ApsaraDB for RDS, and Auto Scaling is ideal. SLB distributes incoming traffic across multiple ECS instances, ensuring high availability and reliability. Auto Scaling automatically adjusts the number of ECS instances based on demand, managing costs efficiently by scaling out during peak times and scaling in when demand decreases. ApsaraDB for RDS provides a managed database service that handles increasing database demands without requiring complex manual scaling. This portfolio is optimal for fluctuating gaming traffic as it ensures load balancing, scalability, and cost control.
質問 # 88
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. True
- B. False
正解：A
解説：
Explanation
Alibaba Cloud Content Delivery Network (CDN) is a distributed network that delivers content to users based on their geographic locations. CDN can reduce the latency and improve the user experience of accessing content from the Internet. CDN can also reduce the Internet downstream traffic of OSS by caching the content in the edge nodes of CDN. The Internet traffic cost of CDN is lower than that of OSS, and the back-to-source traffic cost from CDN to OSS is also lower than a user access to OSS directly. Therefore, using CDN can reduce the traffic cost of OSS. References: Object Storage Service (OSS) - Alibaba Cloud, Storage Services Overview:OSS - Alibaba Cloud, Introduction to Object Storage Service - Alibaba Cloud, Object Storage Service(OSS): Store Data Safely In The Cloud
質問 # 89
Alibaba Cloud Object Storage OSS can upload object files through the console. What is the largest object file that can be uploaded?
- A. 1TB
- B. 5GB
- C. 1GB
- D. 10GB
正解：B
解説：
Using a single PUT upload through the console, the maximum file size is 5GB. For larger files, multipart uploading should be used, which allows uploads up to 5TB by splitting files into smaller parts.
質問 # 90
OSS supports deleting buckets. Before deleting a bucket, you must delete all the files in the bucket, including incomplete upload segments.
- A. TRUE
- B. FALSE
正解：A
解説：
In Alibaba Cloud OSS, a bucket cannot be deleted until all contents, including files and incomplete multipart upload segments, are removed. This prevents accidental data loss by ensuring no objects remain in the bucket before deletion.
質問 # 91
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.
正解：A
質問 # 92
......
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