Practice Test

True/False: CloudFront is a service provided by Amazon Web Services (AWS) that speeds up content delivery by implementing caching mechanisms.

  • True
  • False

Answer: True

Explanation: Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency and high transfer speeds.

Which of the following AWS services can be used as an origin with CloudFront?

  • A. AWS S3
  • B. Amazon EC2
  • C. Amazon RDS
  • D. All of the above

Answer: D. All of the above

Explanation: CloudFront supports S3, EC2, ELB (Elastic Load Balancer), and on-premises servers as origins.

What is the use of Origin Access Identity (OAI) in Amazon CloudFront?

  • A. To enhance the security of the S3 bucket
  • B. To provide a public IP to the S3 bucket
  • C. To speed up the content delivery
  • D. None of the above

Answer: A. To enhance the security of the S3 bucket

Explanation: OAI is a special CloudFront user that helps to secure your S3 bucket contents. It prevents users from accessing the S3 files directly and forces them to go through CloudFront.

True/False: CloudFront and S3 can be used together but Origin Access Control (OAC) has no significant role in this set up.

  • True
  • False

Answer: False

Explanation: OAC plays a crucial role in enhancing the security of your content when CloudFront and S3 are used together. It enforces the restriction of access to the asked content only through the CloudFront distribution.

What happens if you remove or modify the OAC identity after creating the CloudFront distributions?

  • A. Changes the public IP of the S3 bucket
  • B. Nothing changes
  • C. Breaks the link between the CloudFront distribution and the S3 bucket
  • D. None of the above

Answer: C. Breaks the link between the CloudFront distribution and the S3 bucket

Explanation: Modifying or removing the OAC identity after creating distributions will break the link between your CloudFront distribution and your S3 bucket.

What is the ideal access policy to be chosen for S3 bucket when working with CloudFront?

  • A. Public access
  • B. Private access
  • C. CloudFront access only
  • D. Any of the above

Answer: C. CloudFront access only

Explanation: To ensure users cannot directly access your S3 content, but must access it via CloudFront, it is advisable to set S3 bucket policy as ‘CloudFront access only’.

True/False: You can add CloudFront to an existing S3 bucket without requiring any changes.

  • True
  • False

Answer: True

Explanation: You can add Amazon CloudFront to an existing S3 bucket without rewriting URLs in your application or making other changes that could interrupt viewers accessing your content.

Can multiple CloudFront distributions be created for the same S3 bucket?

  • A. Yes
  • B. No

Answer: A. Yes

Explanation: You can create multiple CloudFront distributions that use the same Amazon S3 bucket as the origin.

Which of the following can set the origin to allow CloudFront to communicate with your Amazon S3 Origin Access Identity (OAI)?

  • A. CloudFront Distribution setting
  • B. S3 Bucket policy
  • C. Both A and B
  • D. None of the above

Answer: C. Both A and B

Explanation: Configuring CloudFront to communicate with your S3 bucket involves settings in your CloudFront distribution and adjustments to your S3 bucket policy.

True/False: The use of Amazon CloudFront with S3 would reduce costs compared to using S3 directly.

  • True
  • False

Answer: True

Explanation: Amazon CloudFront provides cost benefits by caching content closer to the users and reducing the amount of data that an application serves directly from its origin servers.

Interview Questions

What is Amazon CloudFront?

Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, all within a developer-friendly environment.

What is Amazon S3?

Amazon S3 (Simple Storage Service) is an object storage service that offers industry-leading scalability, data availability, security, and performance.

What is the purpose of using Origin Access Identity (OAI) in Amazon CloudFront?

An OAI is a special CloudFront user that helps you secure content in your S3 bucket. When you associate an OAI with a CloudFront distribution and enable the Restrict Bucket Access option, the OAI allows CloudFront to access the objects in your bucket and serve them to your customers.

How do you create an Origin Access Identity (OAI) for Amazon CloudFront?

You can create an OAI from the CloudFront console by navigating to the “Origin Access Identity” section and clicking on the “Create OAI” option.

What happens when you restrict access to your Amazon S3 bucket to only CloudFront?

When you restrict access to your Amazon S3 bucket to only CloudFront, only the CloudFront distribution (identified by the OAI) can access objects in your bucket. It prevents users from accessing the content directly from the S3 bucket URL.

How can you restrict your Amazon S3 bucket to a particular Amazon CloudFront distribution?

You can restrict your Amazon S3 bucket to a particular Amazon CloudFront distribution by editing the S3 bucket policy to allow access only to the OAI of the respective CloudFront distribution.

How would you configure S3 to only allow access through CloudFront?

To configure S3 to only allow access through CloudFront, you need to create an Origin Access Identity (OAI) and then modify your S3 Bucket Policy to only allow the CloudFront OAI while denying all other access.

Is it possible to use S3 transfer acceleration with CloudFront?

No, S3 Transfer Acceleration and CloudFront are both designed to accelerate file transfer. Using both simultaneously would not increase the file transfer speed and would only lead to additional charges.

Does enabling server access logging for your S3 bucket or CloudFront log files incur additional cost?

Yes, enabling server access logging for your S3 bucket or CloudFront can incur additional costs because the logs are stored in your S3 bucket, and standard S3 pricing applies for storing and accessing these log files.

How can you verify if CloudFront has been correctly configured with an S3 origin server in a restricted access mode?

One way to verify is by trying to access the file directly from the S3 URL. If access is denied and the file is only accessible through CloudFront, it suggests that CloudFront and S3 are configured correctly.

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