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Liam ' s company operates an on-premises data analytics platform across 12 servers. The system runs scheduled jobs (70% of the time, each job taking anywhere from 20 minutes to 2 hours to complete, with tight SLAs) and user jobs (30% of the time, each job taking less than 5 minutes, with no SLA requirements).
Scheduled jobs must continue to meet SLAs during system failures, while user jobs can be delayed.
As a Cloud Architect, you are tasked to migrate the system to Alibaba Cloud ECS using a consumption-based model while maintaining the same high availability and SLA requirements.
Which solution is the MOST cost-effective and flexible?

• A. Choose an Alibaba Cloud region and split the 12 instances across three zones. Use a savings plan to run
  3 pay-as-you-go instances in each zone. Run 1 preemptible instance in each zone.
• B. Choose an Alibaba Cloud region and split the 12 instances across two zones. Use reserved instances to run 2 pay-as-you-go instances in each zone. Run 4 preemptible instances in each zone.
• C. Choose an Alibaba Cloud region and split the 12 instances across three zones. Use reserved instances to run 3 pay-as-you-go instances in each zone. Run 1 preemptible instance in each zone.
• D. Choose an Alibaba Cloud region and split the 12 instances across three zones. Use reserved instances to run 6 pay-as-you-go instances in a single zone. Run 3 preemptible instances in each of the remaining two zones.

Sam runs a gaming startup, and is launching a real-time, massively multiplayer game on Alibaba Cloud.
Based on presales numbers, the startup predicts that there will be millions of concurrent users at launch. To ensure the experience of the gamers, their architecture must be able to deliver sub-50ms latency, scale automatically in response to sudden player surges, and provide efficient session management for millions of concurrent users.
What Alibaba Cloud services can Sam leverage to meet the requirements for the playerbase? (Correct answers: 3)

• A. Enable Auto Scaling groups for ECS instances based on CPU utilization.
• B. Use Alibaba Cloud CDN for static assets like game textures.
• C. Use Application Load Balancer (ALB) to distribute traffic to game servers.
• D. Store player data in ApsaraDB for MongoDB to handle unstructured data.
• E. Deploy Tair (Redis OSS-Compatible) for low-latency session caching.

Camila has set up a simple blog hosted on a single Elastic Compute Service (ECS) instance, storing images and files on an Elastic Block Storage (EBS) disk within the ECS instance, and relying on an ApsaraDB RDS for MySQL instance for its data tier. Camila wants to scale up her blog and enhance both resilience and performance with minimal changes to the application.
As a Cloud Architect, which combination of actions can you take to improve both resilience and performance of the website? (Correct answers: 3)

• A. Migrate the images and files to a File Storage NAS instance that is mounted on every ECS instance.
• B. Migrate the images and files to an Object Storage Service (OSS) bucket that is mounted via ossfs to every ECS instance.
• C. Configure an accelerated IP address in Global Accelerator for the access endpoint.
• D. Configure an Alibaba Cloud CDN distribution for the website.
• E. Take a snapshot of the current ECS instance and create a custom image. Use the image to provision a new ECS instance, and add both the original and new instances to a scaling group. Set up an Application Load Balancer (ALB) in front of the scaling group, and configure the scaling group to maintain a minimum of two ECS instances.

A multinational corporation is designing its network architecture on Alibaba Cloud to support its distributed applications. Their requirements include:
* Private and high-speed connectivity between on-premises data centers and Alibaba Cloud VPCs across multiple regions.
* Centralized management and enforcement of network security policies.
* Comprehensive monitoring and logging of all network traffic for compliance and auditing purposes.
Which combination of Alibaba Cloud services should the corporation implement to meet these requirements MOST effectively? (Correct answers: 2)

• A. Deploy multiple VPN Gateways in each region and manage connections individually.
• B. Use Alibaba Cloud Express Connect with Transit Router and integrate with Security Center.
• C. Set up Cloud Enterprise Network (CEN) and integrate with Simple Log Service.
• D. Implement VPC peering between all regional VPCs and utilize Security Groups for access control.
• E. Deploy Alibaba Cloud Global Accelerator for all inter-region traffic routing.

Clarence runs a retail company that hosts an e-commerce website on Alibaba Cloud across multiple Alibaba Cloud regions. Clarence wants the website to be operational at all times to ensure customers can make purchases around the clock. The website stores data in a PolarDB for MySQL instance.
Which of the following solutions will provide the HIGHEST availability for the database?

• A. Utilize the Global Database Network (GDN) to establish cross-region clusters for PolarDB, enabling both read and write operations across multiple regions. In case of a failure, seamlessly direct traffic to a secondary region that can serve as the primary node, maintaining high availability and minimal downtime.
• B. Deploy the Cluster Edition of PolarDB for MySQL to ensure that the system can elect a new primary node from read-only nodes when the primary node fails. Ensure that the website is configured to reconnect to the cluster after the failover.
• C. Configure cross-region backup and restoration in PolarDB. During disruptions, restore the latest backup set to a new PolarDB cluster in another region. Redirect application traffic to this restored cluster and configure read/write splitting for this cluster.
• D. Create two PolarDB for MySQL clusters configured with read/write splitting in two different regions.
  When a region fails, use Function Compute to replicate the data in the read-only nodes to the healthy region. Then, configure the website to fail over to the healthy region.