Question # 1
| 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. A user request is directed to the server nearest to the customer based on location
information of the pre-configured IP section. | | B. The intelligent DNS resolution can parse the same domain name into different IP
addresses based on the IP of different visitors. | | C. 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 | | D. 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. 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
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.
References:
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
Question # 2
Different Alibaba Cloud VPCs are completely isolated from each other.
By default, the VPCs cannot communicate with each other over Intranet, but you can
establish VPN connections via the Internet to achieve interconnection between VPCs. | | A. True | | B. False |
B. False
Explanation: Different Alibaba Cloud VPCs are completely isolated from each other by
default, but they can communicate with each other over the intranet by using different
methods, such as Cloud Enterprise Network (CEN), VPN gateways, VPC peering
connections, and PrivateLink. These methods allow you to establish secure and reliable
connections between VPCs without exposing your network traffic to the
internet. References:
Overview of VPC connections - Alibaba Cloud
Cross-VPC peering - Alibaba Cloud
ALIYUN::VPC::VpcPeerConnection - Alibaba Cloud
Question # 3
| 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 |
B. False
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 crossregion
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
Question # 4
| 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 |
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
Question # 5
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. True | | B. False |
A. True
Explanation: 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 client’s real IP address. However, SLB also provides a feature called XForwarded-
For (XFF) that can help you obtain the real IP address of the client. XFF is a
standard HTTP header field that records the original IP address of the client and the proxy
servers that the request passes through. You can enable XFF on the SLB console or by
using the API, and then configure your backend ECS instance to parse the XFF header
field and get the real IP address of the client.
Question # 6
| A video company uses SLB to distribute user requests to 20 ECS instances with the same
configuration to response these requests. As the Spring Festival approaches, service traffic
would double during holidays (based on past experience). Thus, you use Auto Scaling to
elastically adjust computing resources. Since the services is online for many years, you
have historic records that can help predict the upcoming service traffic and choose the
scaling mode freely. In this scenario, which of the following options are feasible and with
minimum operation efforts? (Number of correct answers: 2) | | A. Cloud monitor and event-triggered task: Dynamically adds ECS instances during
resource shortage and reduces ECS instances during idle hours by monitoring the CPU
utilization rate and workload | | B. Scheduled task: Increases the number of ECS instances to 40 on the first day of the
holidays and reduce the number to 20 after the holidays | | C. Manual mode: Set the minimum number of instances to 40 on the first day of the
holidays and change the number to 20 after the holidays. | | D. Healthy check mode: Ensures that all the current ECS instances in scaling groups are
working correctly to meet user access requests. |
A. Cloud monitor and event-triggered task: Dynamically adds ECS instances during
resource shortage and reduces ECS instances during idle hours by monitoring the CPU
utilization rate and workload
B. Scheduled task: Increases the number of ECS instances to 40 on the first day of the
holidays and reduce the number to 20 after the holidays
Explanation: According to the Alibaba Cloud Academy, Auto Scaling supports three
scaling modes: manual mode, scheduled task, and cloud monitor and event-triggered task.
Manual mode requires manual intervention to adjust the number of ECS instances, which is
not feasible and with minimum operation efforts. Scheduled task allows you to set the time
and number of ECS instances to be added or removed in advance, which is suitable for
predictable traffic changes. Cloud monitor and event-triggered task allows you to set the
monitoring metrics and thresholds for scaling actions, which is suitable for dynamic traffic
changes. Healthy check mode is not a scaling mode, but a feature of SLB to ensure the
availability of ECS instances behind the load balancer. References: : ACP Cloud
Computing Certification Preparation Course - Auto Scaling, : ACP Cloud Computing
Certification Preparation Course - Server Load Balancer
Question # 7
| By using ApsaraDB for RDS to implement read/write splitting, which of the following can be
achieved? (Number of correct answers 2) | | A. Write requests are distributed to multiple instances. | | B. Read requests are distributed to multiple instances. | | C. Read/write requests to the database are separated. | | D. Both read and write requests are distributed to multiple instance |
B. Read requests are distributed to multiple instances.
C. Read/write requests to the database are separated.
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