A company is building a big data analytics platform on Alibaba Cloud to process and analyze petabytes of data. They require a highly scalable storage solution that can handle both structured and unstructured data, and a processing framework that supports batch and interactive queries.
Which combination of Alibaba Cloud services should the company use to build this platform? (Correct answers: 3)

• A. MaxCompute
• B. Object Storage Service (OSS)
• C. Elasticsearch
• D. PolarDB for PostgreSQL
• E. E-MapReduce (EMR)

Paul runs a successful online game. The game is deployed as a three-tier architecture in a VPC with ApsaraDB RDS for MySQL at the database layer. The game allows players to compete in real-time, and Paul wants to display a top-10 scoreboard in near-real time.
As a Cloud Architect, which of the following solutions would you propose for Paul ' s use case?

• A. Create a read replica in ApsaraDB for RDS MySQL to run queries to compute the scoreboard and serve the read traffic to the web application.
• B. Place an Alibaba Cloud CDN distribution in front of the web application to cache the scoreboard in a section of the application.
• C. Set up an Alibaba Cloud ApsaraDB for PostgreSQL cluster to cache the scores for the web application to display.
• D. Set up an Alibaba Cloud Tair (Redis OSS-Compatible) cluster to compute and cache the scores for the web application to display.

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)

• A. Use Data Transmission Service (DTS) to migrate from the Oracle database to a PolarDB for PostgreSQL (Compatible with Oracle) database.
• B. Rehost the application on Elastic Compute Service (ECS) Windows Server instances deployed across multiple zones.
• C. Use Data Transmission Service (DTS) to migrate from the Oracle database to a self-managed Oracle database on Elastic Compute Service (ECS) instances deployed across multiple zones.
• D. Refactor the application to run on an Elastic Compute Service (ECS) Alibaba Cloud Linux instance.
• E. Refactor the application as serverless using Alibaba Cloud Function Compute.

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)

• A. Create a security group for the RDS instance. Add a rule to deny all traffic except traffic from the web servers ' security group on port 3306.
• B. Create a security group for the RDS instance. Add a rule to allow traffic from the web servers ' security group on port 3306.
• C. Create a network ACL for the public vSwitch. Add a rule to deny outbound traffic to 0.0.0.0/0 on port
  3306.
• D. Create a security group for the web servers in the public vSwitch. Add a rule to allow traffic from
  0.0.0.0/0 on port 443.
• E. Create a security group for the RDS instance. Add a rule to allow traffic from the public vSwitch CIDR block on port 3306.