Which of the following statements is NOT correct, when comparing RDS with a self-built database?
A
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. Reference: = ApsaraDB for RDS vs.
Self-built Databases - Alibaba Cloud
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?
B
Explanation:
According to the Alibaba Cloud documentation1, Auto Scaling is a service that automatically adjusts
the number of elastic computing resources based on your business demands and policies. When the
demand for computing resources increases, Auto Scaling automatically adds ECS instances to ensure
sufficient computing capabilities. When the demand decreases, Auto Scaling automatically removes
ECS instances to reduce costs.
Auto Scaling supports adding an existing ECS instance into the scaling group, but the instance must
meet some requirements1. One of the requirements is that the instance and the scaling group must
be in the same region. However, they do not have to be in the same zone. A zone is a physical area
within a region that has independent power grids and networks. A region is a geographic area where
Alibaba Cloud deploys its resources. Therefore, the correct answer is B.
Reference:
1: Auto Scaling: Automatically Adjusts Computing Resources - Alibaba Cloud
2: Introduction to Auto Scaling - Alibaba Cloud Document Center
Recently, response speed of a certain Alibaba Cloud Elastic Compute Service (ECS) instance is
unacceptably slow. By using CloudMonitor we discovered that the ECS instance utilizes more than
80% of the assigned bandwidth.
Which of the following approach can address this issue and without the need to reboot the ECS
instance?
A
Explanation:
According to the Alibaba Cloud Elastic Compute Service documentation, if the current public
bandwidth does not meet your business requirements, you can upgrade or downgrade the public
bandwidth configurations without the need to reboot the ECS instance. This can improve the
network performance and response speed of the ECS instance. Upgrading the CPU, memory, or disk
of the ECS instance may not solve the issue of bandwidth utilization, and may require rebooting the
ECS instance. Reference: Public bandwidth - Elastic Compute Service
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
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.
Reference:
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
Which of the following statements is most accurate about the Data Transmission Service (DTS)
database migration function?
C
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 database schema replication between
instances, which means that DTS can automatically create the same schema as the source database
in the target database. DTS also supports warning when source and destination has some unresolved
conflict found, such as data type mismatch, primary key conflict, or foreign key constraint violation.
DTS can help you resolve these conflicts by providing suggestions or allowing you to modify the data
mapping rules. Therefore, the correct answer is C. Supports all of the above functions. Reference:
1: Data Transmission Service - Alibaba Cloud
2: What is Data Transmission Service? - Alibaba Cloud
3: Database Migration - AlibabaCloud
4: Cloud Migration without Stopping Services: Alibaba Cloud DTS
Alibaba Cloud Object Storage Service (OSS) is a cloud storage service that features massive capacity,
outstanding security, low costs, and high reliability. In an OSS bucket, all elements are stored
as________.
C
Explanation:
OSS does not use a hierarchical structure for objects, but instead uses a flat structure. All elements
are stored as objects in buckets. To use OSS in the same manner in which local file systems are used,
you can configure Cloud Storage Gateway (CSG).
https://www.alibabacloud.com/help/doc-detail/31817.htm
The statement C is correct, because in an OSS bucket, all elements are stored as objects. An object is
the basic unit of OSS storage. Each object consists of a unique key, data, and metadata. The key is the
name of the object, which is used to identify the object in a bucket. The data is the content of the
object, which can be any type of file, such as text, image, video, or audio. The metadata is the
information about the object, such as its size, type, creation time, and custom attributes. Reference:
= Object Storage Service:Overview - Alibaba Cloud
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
Explanation:
OSS logging is a feature that allows you to record the access requests to your OSS buckets. You can
enable and configure logging for a bucket in the OSS console or by using the OSS API. When logging is
enabled for a bucket A, OSS automatically generates access log objects every hour and stores them in
a specified bucket B. The log objects follow a predefined naming convention that includes the source
bucket name, the date, the hour, and a unique string.
The documentation also states that buckets A and B can be separate buckets or the same bucket, but
they must belong to the same user1. This means that you cannot store the access logs of one user’s
bucket in another user’s bucket. Therefore, the correct answer is A.
Reference:
1: Logging - Object Storage Service - Alibaba Cloud Documentation Center
A new media company uses a mobile app to provide news and information services. They utilize
Auto Scaling to add/reduce ECS instances dynamically to address service traffic spikes.
Based on the estimation of their service and technical personnel the company thinks they require 10
ECS instances during idle hours and 10 to 20 ECS instances (dynamically adjusted) during some busy
hours, which are normally from 07:30 to 09:00 and from 18:30 to 20:00 In the scaling group; they set
the "Minimum number of instances" to 10 and "Maximum number of instances" to 20.
To simplify deployment tasks and save costs, which of the following scaling modes should they
choose?
B
Explanation:
According to the Alibaba Cloud Auto Scaling documentation, scheduled mode allows you to
configure the scheduled tasks by adding or removing ECS instances for a fixed time. This mode is
suitable for scenarios where the service traffic spikes are predictable and periodic. For example, a
new media company can use scheduled mode to add or reduce ECS instances dynamically to address
service traffic spikes during some busy hours, such as from 07:30 to 09:00 and from 18:30 to 20:00.
This mode can help simplify deployment tasks and save costs by avoiding unnecessary scaling
activities. Reference: How Auto Scaling works - Auto Scaling - Alibaba Cloud Documentation Center.
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.
C
Explanation:
Intelligent DNS resolution is a feature of Alibaba Cloud DNS that allows users to configure different IP
addresses for the same domain name based on the geographic locations or ISPs of the visitors. This
way, visitors can access the nearest or optimal server for better performance and availability.
Intelligent DNS resolution does not support web page content caching, which is a function of Alibaba
Cloud CDN. Alibaba Cloud CDN is a distributed network that delivers content from the origin server
to the edge nodes closest to the end users, reducing the network latency and bandwidth
consumption. Alibaba Cloud CDN caches the static content of the web pages, such as images, CSS,
and JavaScript files, on the edge nodes, so that the users can access them faster and reduce the load
on the origin server. A user will receive data from the cache in the first-time access, and then will be
updated from the origin site in subsequent requests based on the cache expiration time.
Reference:
1: Intelligent DNS resolution - Alibaba Cloud DNS - Alibaba Cloud Documentation Center
4: 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.
5: Alibaba Cloud DNS:Alibaba Cloud line for intelligent DNS resolution (September 16, 2020) -
Alibaba Cloud Documentation Center
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
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. Reference:
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
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?
D
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. Reference: Create a read-only ApsaraDB RDS for MySQL instance,
Instance types for read-only ApsaraDB RDS instances
Compared with traditional physical servers, upgrading an ECS instance is much easier. Which of the
following statements about upgrading an ECS instance is false?
D
Explanation:
Changing an instance’s operating system requires creating a custom image or using a public image,
and then replacing the system disk of the instance. This process will cause the instance to restart.
Therefore, this statement is false. Reference: ECS User Guide: Replace the system disk (non-public
image) and ECS User Guide: Replace the system disk (public image)
Which of the following privilege is required to manually install Alibaba Clod Security Center on the
server?
C
Explanation:
To manually install Alibaba Cloud Security Center on the server, you need to have the system
administrator privilege. This is because the Security Center agent requires access to the system files
and processes, and can perform security operations such as vulnerability scanning, intrusion
detection, and threat blocking. A common user privilege or a database access privilege is not
sufficient to install the Security Center agent. An FTP service privilege is irrelevant to the installation
process.
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
C
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. Reference: What is Alibaba Cloud CDN? -
CDN - Alibaba Cloud Documentation Center and Alibaba Cloud CDN
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.
B
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. Reference:
Bastion Host, Access an ECS Instance by Using a Bastion Host