[AWS] Solutions Architect Associate 실습 14일차 - EC2 Basic Test 문제 / 정리

1. Which of the following EC2 purchasing options offers the highest discount but is not suitable for databases or critical workloads?

질문 1. 다음 중, 할인 폭이 가장 크나, 데이터베이스 혹은 중요 업무에는 적합하지 않은 EC2 구매 옵션은 무엇인가요?

✔️ 1)  Spot Instances (스팟 인스턴스)
❌ 2) On-demand (온디맨드)
❌ 3) Dedicated Hosts (전용 호스트)
❌ 4) Reserved Instances (예약 인스턴스)

Spot Instances are suitable for short-term workloads and are the most cost-effective EC2 purchasing option. However, since there is a risk of losing the EC2 instance, they are less reliable.

 

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2. What should be used to control traffic inside and outside an EC2 instance?

질문 2. EC2 인스턴스 내/외의 트래픽을 제어하기 위해서는 무엇을 사용해야 하나요?
 
❌ 1) Network Access Control List (NACL) - 네트워크 액세스 제어 리스트
✔️ 2) Security Group (보안 그룹)
❌ 3) IAM Policy (IAM 정책)
 
Security groups operate at the EC2 instance level and can control traffic.
 

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3. What is the reservation period for EC2 Reserved Instances?

질문 3. EC2 예약 인스턴스를 예약할 수 있는 기간은 얼마인가요?
 
✔️ 1) 1 year or 3 years
❌ 2) 2 years or 4 years
❌ 3) 6 months or 1 year
❌ 4) a period between 1 and 3 years
 

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4. You want to deploy a High-Performance Computing (HPC) application on an EC2 instance. Which of the following EC2 instance types should you choose?

질문 4. EC2 인스턴스에 고성능 컴퓨팅(HPC) 애플리케이션을 배포하려 합니다. 다음 중 어떤 EC2 인스턴스 유형을 선택해야 할까요?
 
❌ 1) Storage-optimized (스토리지 최적화)
✔️ 2) Compute-optimized (컴퓨팅 최적화)
❌ 3) Memory-optimized (메모리 최적화)
❌ 4) General-purpose (범용)

Compute-optimized EC2 instances are suitable for compute-intensive workloads that require high-performance processors, such as batch processing, media transcoding, high-performance computing, scientific modeling, machine learning, and dedicated gaming servers.

 

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5. For an application that plans to run servers continuously for one year, which of the following EC2  purchasing options should be used?

질문 5. 1년 간 지속적으로 서버를 운영할 계획인 애플리케이션의 경우에는 다음 중 어떤 EC2 구매 옵션을 사용해야 할까요?
 
✔️ 1) Reserved Instances (예약 인스턴스)
❌ 2) On-Demand Instances (온디맨드 인스턴스)
❌ 3) Dedicated Hosts (전용 호스트)
❌ 4) Dedicated Instances (전용 인스턴스)

Reserved Instances are suitable for long-term workloads. EC2 instances can be reserved for a period of 1 year or 3 years.

 

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6. You are planning to run an application that will be hosted on a series of EC2 instances. The application requires software installation and needs some OS packages to be updated during the initial execution. What is the optimal way to launch the EC2 instances for this?

질문 6. 일련의 EC2 인스턴스에 호스팅 될 애플리케이션을 실행하려 합니다. 이 애플리케이션에는 소프트웨어 설치가 필요하며, 최초 실행 중에 일부 OS 패키지를 업데이트해야 합니다. EC2 인스턴스를 실행하려는 경우, 이를 위한 최적의 방식은 무엇일까요?
 
❌ 1) Connect to each EC2 instance via SSH, manually install the required software, and update the OS packages.
❌ 2) Write a bash script to install the required software and update the OS, then contact AWS Support to provide the script, which will be executed when launching the EC2 instance.
✔️ 3) Write a bash script to install the required software and update the OS, then use this script in the EC2 user data during instance launch.
 
1) SSH를 통해 각 EC2 인스턴스에 연결한 후, 필수 소프트웨어를 설치하고 OS 패키지를 수동으로 업데이트 하기
2) 필수 소프트웨어의 설치 및 OS 업데이트를 수행하는 bash script를 작성한 후, AWS 지원 센터에 연락해 스크립트 제공하기 - 이들은 EC2 인스턴스를 실행할 때 인스턴스에서 실행된다.
3) 필수 소프트웨어의 설치 및 OS 업데이트를 수행하는 bash script를 작성한 후, 이 스크립트를  EC2 인스턴스 실행 시에 EC2 사용자 데이터에서 사용하기

EC2 user data is used to bootstrap EC2 instances with a bash script. This script can include commands to perform tasks such as software/package installation, downloading files from the internet, and other actions you want to automate during instance launch.

 

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7. For a critical application using an in-memory database, which of the following EC2 instance types should you choose?

질문7. 인메모리 데이터베이스를 사용하는 중요 애플리케이션을 위해서는 다음 중 어떤 EC2 인스턴스 유형을 선택해야 할까요?
 
❌ 1) Compute-optimized (컴퓨팅 최적화)
❌  2) Storage-optimized (스토리지 최적화)
✔️  3) Memory-optimized (메모리 최적화)
❌ 4) General-purpose (범용)

Memory-optimized EC2 instances are suitable for workloads that require large datasets in memory.

 

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8. You have an e-commerce application with an OLTP database hosted on-remises. The application is popular, and the database receives thousands of requests per second. You are planning to migrate the database to an EC2 instance. Which EC2 instance type should you choose to handle this high-frequency OLTP database?

질문 8. 온프레미스에 호스팅된 OLTP 데이터베이스를 갖춘 전자 상거래 애플리케이션이 있습니다. 이 애플리케이션은 인기가 좋아, 데이터베이스가 초당 수천 개의 요청을 지니게 됩니다. 여러분은 데이터베이스를 EC2 인스턴스로 이전하려 합니다. 이렇게 높은 빈도를 보이는 OLTP 데이터베이스를 처리하기 위해서는 어떤 EC2 인스턴스 유형을 선택해야 할까요?
 
❌ 1) Compute-optimized (컴퓨팅 최적화)
✔️ 2) Storage-optimized (스토리지 최적화)
❌ 3) Memory-optimized (메모리 최적화)
❌ 4) General-purpose (범용)

Storage-optimized EC2 instances are suitable for workloads that require high levels of sequential read/write access to large datasets on local storage.

 

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9. (True/False) Security groups can only be associated with a single EC2 instance.

❌ False
 Security groups can be associated with multiple EC2 instances, not just one.
 

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10. You are planning to migrate an on-premises application to AWS. Your company has strict regulations that require the application to run on dedicated servers. Additionally, to reduce costs, you need to use software licenses that are bound to dedicated servers. Which of the following EC2 purchasing options is most suitable in this case?

온프레미스 애플리케이션을 AWS로 이전하려 합니다. 여러분의 기업에는 애플리케이션을 전용 서버에서 실행해야 한다는 엄격한 규정이 있습니다. 또한 비용 절감을 위해 전용 서버 바운드 소프트웨어 라이선스를 사용해야 합니다. 이 경우, 다음 중 어떤 EC2 구매 옵션이 적합할까요?
 
❌ 1) Convertible Reserved Instances (전환 가능 예약 인스턴스)
✔️ 2) Dedicated Hosts (전용 호스트)
❌ 3) Spot Instances (스팟 인스턴스)

Dedicated Hosts are suitable for enterprises that require a high level of compliance or have software with complex licensing models. This is the most expensive EC2 purchasing option.

 

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11. You are planning to deploy database technology on an EC2 instance. The vendor's licensing is based on physical cores and visibility of base network sockets. Which EC2 purchasing option should you use to ensure visibility?

질문 11. 데이터베이스 기술을 EC2 인스턴스에 배포하려 합니다. 공급 업체 라이선스는 물리적 코어 및 기반 네크워크 소켓 가시성를 기반으로 비용을 책정합니다. 이 경우, 어떤 EC2 구매 옵션을 사용해야 가시성을 확보할 수 있을까요?
 
❌ 1) Spot Instances (스팟 인스턴스)
❌ 2) On-Deman (온디맨드)
✔️ 3) Dedicated Hosts (전용 호스트)
❌ 4) Reserved Instances (예약 인스턴스)

Dedicated Hosts provide visibility into physical cores and network sockets, which is necessary for the vendor's licensing model based on physical resources.

 

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12. A Spot Fleet is a collection of Spot Instances and, optionally, On-Demand Instances.

질문 12. 스팟 플릿은 스팟 인스턴스의 집합이며, 선택적으로 ___________ 이다.
 
✔️ 1) Reserved Instances (예약 인스턴스)
❌ 2) On-Demand Instances (온디맨드 인스턴스)
❌ 3) Dedicated Hosts (전용 호스트)
❌ 4) Dedicated Instances (전용 인스턴스)

A Spot Fleet is a collection of Spot Instances and, optionally, On-Demand Instances.