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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Core Infrastructure Deep Dive | 26% | - File Storage NAS and block storage - Object Storage Service (OSS) and storage solutions - Elastic Compute Service (ECS) and serverless computing |
| Topic 2: Building Enterprise-grade Networks on Alibaba Cloud | 18% | - VPC design and configuration - Express Connect and VPN Gateway - Network routing and security groups |
| Topic 3: Securing Workloads on Alibaba Cloud | 22% | - WAF, Anti-DDoS and network protection - Data security and compliance best practices - Resource Access Management (RAM) and identity control |
| Topic 4: Delivering Services and Content on Alibaba Cloud | 12% | - CDN and content delivery strategies - Alibaba Cloud DNS and domain management - Service integration and access optimization |
| Topic 5: Building Highly Available, Performant Cloud Architecture | 22% | - Multi-zone deployment and disaster recovery - Auto Scaling and Server Load Balancer (SLB) - Performance optimization and resilience design |
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NEW QUESTION # 17
A company has a web server running on an Elastic Compute Service (ECS) instance that is bound with an Elastic IP address. The ECS instance resides in a default security group within a VPC. The network ACL has been modified to block all traffic. Keran is a Cloud Architect and has been assigned the task of making the web server accessible from everywhere on port 443.
Which combination of steps can Keran take to accomplish this task? (Correct answers: 2)
Answer: A,C
Explanation:
The ECS security group must allow inbound HTTPS traffic. For an inbound security-group rule, the Internet clients are the source, so the correct rule permits TCP destination port 443 from source 0.0.0.0/0. This makes Option C correct. Alibaba Cloud security groups are stateful, which means response traffic belonging to an allowed connection is automatically permitted and does not require a matching outbound security-group rule.
Network ACLs behave differently. Alibaba Cloud VPC network ACLs are stateless. If the ACL permits an inbound HTTPS request but does not permit the corresponding return packet, the TCP session cannot operate correctly. The inbound ACL therefore needs TCP 443 from Internet clients, while the outbound ACL must permit return traffic to client ephemeral destination ports. Alibaba Cloud explicitly recommends 1024-65535 when all client ephemeral-port implementations must be supported.
Option D permits only the incoming side of the ACL and therefore fails because response packets remain blocked. Option E incorrectly assumes that outbound server responses use destination port 443; the server ' s source port is 443, but the destination is the client ' s ephemeral port.
Study Guide reference: Securing Workloads on Alibaba Cloud - stateful Security Groups, stateless network ACLs, HTTPS exposure, and ephemeral ports.
NEW QUESTION # 18
A worldwide retail company is adapting their e-commerce platform to handle spikes in online traffic during annual sales events. They are using Alibaba Cloud services and need a solution that can automatically scale resources to maintain performance during these peaks.
What solutions should the company implement to efficiently manage their resources during high-traffic periods? (Correct answers: 3)
Answer: A,C,D
Explanation:
The strongest architecture for an existing e-commerce platform experiencing predictable but substantial traffic spikes is OSS/CDN + ALB + Auto Scaling. Auto Scaling is specifically designed to increase ECS capacity when traffic or resource utilization rises and remove unnecessary instances after demand subsides. Alibaba Cloud documents this as a core mechanism for handling traffic spikes while avoiding permanent over- provisioning.
ALB complements Auto Scaling by distributing requests across healthy ECS backend instances. As scaling creates additional instances, they can be automatically added to the ALB server group, allowing traffic to use the enlarged compute pool immediately.
Static images and videos should be moved to OSS and accelerated through CDN. CDN caches static resources on geographically distributed edge nodes, substantially reducing requests reaching the ECS application tier and lowering origin bandwidth and processing load during sales events.
Function Compute is highly elastic, but introducing it merely to supplement an existing server-based application normally requires application restructuring. It is therefore less directly applicable than the three mechanisms specifically designed to scale and offload the existing architecture.
Study Guide reference: Building Highly Available, Performant Cloud Architecture - Auto Scaling, ALB, CDN offloading, and elastic ECS architecture.
NEW QUESTION # 19
A global telecommunications company hosts its web application on Alibaba ECS instances behind an Alibaba Cloud Application Load Balancer (ALB). The application has static data stored in Object Storage Service (OSS). The company is aiming to enhance performance and reduce latency for both static and dynamic content. The domain name is maintained by Alibaba Cloud DNS.
Which of the following solutions provides the required functionality with the LEAST configurations?
Answer: D
Explanation:
Option B provides the simplest consolidated content-delivery architecture. Alibaba Cloud CDN can use multiple origins, and current CDN functionality supports origin-selection rules based on parameters such as request path, headers, query strings, and cookies. This allows static requests to be associated with an OSS origin while application requests are forwarded toward the ALB-backed application tier.
Static objects stored in OSS benefit directly from CDN edge caching. Requests are routed to nearby CDN points of presence, and cached resources can be returned without repeatedly accessing the OSS origin, reducing both latency and origin load.
Dynamic responses are generally not cached because they are generated uniquely for requests. They can still be routed to the application origin according to the configured origin rules.
The Global Accelerator alternatives create an unnecessarily fragmented architecture and attempt to use separate acceleration paths where one CDN-facing domain and origin-routing configuration can satisfy the question with fewer components. They also introduce additional DNS and acceleration configuration.
Therefore, a single CDN delivery layer with OSS and ALB-backed origins, combined with Alibaba Cloud DNS directing the application domain to CDN, produces the lowest configuration overhead.
Study Guide reference: Delivering Services and Content on Alibaba Cloud - CDN, OSS acceleration, ALB origins, and intelligent content delivery.
NEW QUESTION # 20
Keanu uses Elastic Compute Service (ECS) instances to run batch jobs to process data at 00:00 AM and 04:00 AM every day. An Auto Scaling group manages the ECS instances, which run as pay-as-you-go instances. If a batch job fails on one instance, another instance will reprocess the job.
Which of the following solutions provides the MOST cost-effective way to run these jobs?
Answer: B
Explanation:
The workload is an excellent candidate for preemptible, currently called spot, ECS capacity because it is short- lived, batch-oriented, horizontally scalable, and explicitly tolerant of interruption. The question states that if an instance fails, another instance can reprocess the job. That removes the main architectural objection to using interruptible compute.
Alibaba Cloud describes ECS spot instances as unused ECS capacity offered at substantially reduced prices compared with standard pay-as-you-go instances. The documented recommended scenarios include short- term tasks, data analytics, and applications that are highly fault tolerant and able to tolerate interruption.
Savings Plans and reserved-instance-style commitments can reduce costs for predictable long-term baseline consumption, but this workload runs only at two scheduled times each day. Purchasing committed capacity for a sporadic workload can leave paid capacity economically underutilized. Higher-specification pay-as-you- go instances also do not inherently minimize compute cost.
Using a launch template with preemptible/spot ECS instances allows Auto Scaling to add inexpensive compute when the batch workload requires it, while the application ' s retry mechanism handles interruptions.
Study Guide reference: Core Compute Infrastructure Deep Dive; Scalable Architecture on Alibaba Cloud; cost optimization for elastic compute.
NEW QUESTION # 21
A company runs an application on an on-premises Windows Server. The application stores data using an Oracle Database Standard Edition server. The company plans to migrate to Alibaba Cloud while minimizing development changes. The Alibaba Cloud application environment should be highly available.
As a Cloud Architect, which combination of actions would you propose the company take to meet these requirements? (Correct answers: 2)
Answer: B,D
Explanation:
Option C provides the lowest-change migration path for the application tier. Rehosting the existing Windows workload on Windows Server ECS instances preserves its operating-system environment while distributing instances across availability zones improves resilience against zone-level infrastructure failures.
For the database tier, Option A provides the stronger managed architecture. Alibaba Cloud explicitly supports using DTS to migrate self-managed Oracle databases to PolarDB for PostgreSQL (Compatible with Oracle), including schema, full-data, and incremental-data migration for minimal migration downtime.
PolarDB ' s Oracle-compatible edition is specifically engineered to run Oracle workloads with minimal application modification. It supports Oracle-compatible data types, SQL constructs, PL/SQL features, OCI connectivity, packages, sequences, synonyms, and related functionality.
It also provides built-in high availability: failures are detected automatically and workloads can fail over to healthy nodes. This provides a more complete managed availability architecture than simply deploying independent self-managed Oracle servers across zones, which would additionally require Oracle-level replication/failover configuration.
Options B and D require substantial application refactoring and therefore conflict with the explicit requirement to minimize development changes.
Study Guide reference: Building Highly Available, Performant Cloud Architecture - workload migration, ECS multi-zone design, DTS, and PolarDB Oracle compatibility.
NEW QUESTION # 22
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