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| Section | Weight | Objectives |
|---|---|---|
| Delivering Services and Content on Alibaba Cloud | 12% | - Delivering Services and Content on Alibaba Cloud
|
| Securing Workloads on Alibaba Cloud | 22% | - Alibaba Cloud Security Deep Dive
|
| Building Enterprise-grade Networks on Alibaba Cloud | 18% | - Cloud Networking Deep Dive
|
| Building Highly Available, Performant Cloud Architecture | 22% | - Leveling up Your Core Infrastructure
|
| Core Infrastructure Deep Dive | 26% | - Core Compute Infrastructure Deep Dive
|
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NEW QUESTION # 22
An application runs on an Elastic Compute Service (ECS) with an Elastic IP address in VPC A within Alibaba Cloud. The application requires access to a database in VPC B. Both VPCs are in the same Alibaba Cloud account.
Which of the following solutions will provide the required access MOST securely?
Answer: D
Explanation:
VPC peering provides direct private communication between two VPCs without exposing either application or database traffic to the public Internet. Alibaba Cloud VPCs are isolated by default. After creating a peering connection and configuring the required bidirectional routes, resources in VPC A and VPC B can communicate using private IP addresses. VPC peering supports same-account and cross-account connections as well as same-region and cross-region configurations.
This is materially more secure than exposing the database publicly. The application ' s existing EIP does not need to participate in database connectivity; the application can use its ECS private address when communicating across the peering link. Security-group and database whitelist rules should then restrict access to only the required source CIDRs and ports.
Option A intentionally routes database access through public addressing. Option B introduces an unnecessary proxy server, additional management overhead, and another failure point. Option D creates the largest attack surface by making the database Internet-accessible.
The design principle is straightforward: when workloads in two Alibaba Cloud VPCs require direct communication, establish private network connectivity and keep sensitive database traffic off the Internet.
Study Guide reference: Building Enterprise-grade Networks on Alibaba Cloud - VPC isolation, VPC peering, routing, and private database access.
NEW QUESTION # 23
An application runs on an ECS instance in a VPC. The application reads and processes logs that are stored in an OSS bucket in the SAME region. For security reasons, the ECS instance needs to access the OSS bucket without connectivity to the Internet.
Which of the following solutions can BEST provide private network connectivity to OSS?
Answer: A
Explanation:
OSS provides region-specific internal endpoints specifically for private access from Alibaba Cloud compute resources. When an ECS instance and an OSS bucket reside in the same region, the ECS instance can access the bucket using an internal OSS domain such as an oss- < region > -internal.aliyuncs.com endpoint. Traffic remains on Alibaba Cloud ' s internal network instead of traversing the public Internet.
This directly satisfies the security requirement without adding unnecessary networking components. The ECS instance does not require an EIP, NAT Gateway, or Internet connectivity for the OSS data path.
VPN Gateway is intended primarily for connecting VPCs to on-premises networks or other private networks; it is unnecessary for same-region OSS access. PrivateLink has legitimate private-service connectivity use cases, but the presence of a native OSS internal endpoint makes it unnecessary here. A VPC gateway endpoint may be relevant to certain Alibaba Cloud service integrations, but it is not required for this straightforward same-region ECS-to-OSS architecture.
The important exam design principle is to prefer a service ' s native private endpoint when one exists and the workload is already located inside the corresponding Alibaba Cloud region.
Study Guide reference: Building Enterprise-grade Networks on Alibaba Cloud - VPC private connectivity and OSS internal endpoints.
NEW QUESTION # 24
You ' ve been hired to design a highly available application consisting of web, application, and database tiers.
HTTPS content delivery should be as close to the edge as possible, with the least delivery time.
Which of the following solutions meets these requirements and is MOST secure?
Answer: B
Explanation:
Option B provides both an appropriate security boundary and an optimized delivery path. Alibaba Cloud CDN should be the Internet-facing content-delivery layer so that cacheable HTTPS resources are served from edge points of presence close to users. Alibaba Cloud currently supports directly configuring an ALB instance domain as a CDN origin, producing the request path client # CDN # ALB # backend server. This prevents clients from bypassing the load-balancing tier and preserves centralized health checking and traffic distribution.
The backend ECS instances should remain on private network addresses rather than being individually Internet-exposed. For an Internet-facing ALB, external traffic reaches the ALB through its public EIP and is then forwarded internally to backend ECS private IP addresses. This substantially reduces the attack surface while retaining public application availability.
Options C and D unnecessarily expose ECS instances through public networking. Option A uses private ECS instances, but making the individual application servers the CDN origins bypasses the ALB ' s centralized distribution and availability functions. Therefore, CDN # ALB # private ECS is the strongest architecture.
Study Guide reference: Delivering Content on Alibaba Cloud; Delivering Services on Alibaba Cloud; Highly Available Architecture.
NEW QUESTION # 25
A Cloud Architect is designing a two-tiered architecture that includes a public vSwitch and a database vSwitch. The web servers in the public vSwitch must be open to the Internet on port 443. The ApsaraDB RDS for MySQL instance in the database vSwitch must be accessible only to the web servers on port 3306.
Which combination of actions should the Cloud Architect take to meet these requirements? (Correct answers:
2)
Answer: B,D
Explanation:
The public web tier needs an inbound security-group rule permitting TCP 443 from Internet clients.
Therefore, Option E is required. Security groups act as virtual firewalls and should expose only application ports required by the workload. Alibaba Cloud recommends allowing public access only to necessary web- service ports such as HTTPS 443 while keeping internal services inaccessible from the Internet.
For the database tier, access should be limited to ECS instances belonging to the web-server security group.
Alibaba Cloud RDS for MySQL supports associating an ECS security group with an RDS instance, allowing ECS instances in that group to connect without adding every server address individually to an IP whitelist.
This is particularly useful when application-server membership changes dynamically.
Option B is overly broad because every resource within the public vSwitch ' s CIDR could potentially be authorized rather than only the approved web tier. Option C would prevent legitimate database traffic. Option D is unnecessary because RDS access behaves as an allow-list model: only explicitly authorized addresses or associated security-group members should be granted database access.
Thus, Internet clients reach the web tier only over HTTPS, while MySQL accepts access only from the authorized application servers.
Study Guide reference: Securing Workloads on Alibaba Cloud - Security Groups, RDS access control, least privilege, and tiered network segmentation.
NEW QUESTION # 26
Sandra hosts a web application on a single ECS instance that stores documents uploaded by users in an EBS data disk. As the requirements grow, they duplicate the application and host it in a second ECS instance in a different zone. An ALB instance is used to distribute traffic between these ECS instances. However, after completing this change, users reported that every time they access the web application, they could only see some of their documents at any given time, but never all of the documents at the same time.
As a Cloud Architect, how would you solve this issue?
Answer: D
Explanation:
The architectural defect is that application state is stored independently on local block storage attached to each ECS instance. ALB can route successive requests to either backend, so each server exposes only the files stored on its own EBS disk. The correct solution is therefore to separate persistent shared data from individual compute instances.
Alibaba Cloud File Storage NAS provides shared file storage that can be mounted concurrently by multiple ECS instances. A single NAS file system becomes the authoritative repository for uploaded documents, so regardless of which ECS instance receives a request, both instances access the same underlying dataset.
Alibaba Cloud explicitly supports mounting NAS on multiple ECS instances for shared access.
Periodic EBS synchronization is operationally fragile and introduces consistency windows. ALB session persistence would merely hide the architectural problem and would fail when an ECS instance becomes unavailable or is replaced. Sending every request to both servers would also complicate application logic and still leave divergent storage.
Moving the data to NAS converts the application tier into a horizontally scalable compute layer while maintaining one consistent shared filesystem.
Study Guide reference: Core Infrastructure Deep Dive - ECS storage patterns, File Storage NAS, shared storage, and stateless application architecture.
NEW QUESTION # 27
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