Practice Test

Single Select: What is the primary goal of implementing caching in a cloud platform?

  • A) Decreasing the storage costs
  • B) Reducing read latency
  • C) Enhancing security
  • D) Increasing the traffic

Answer: B) Reducing read latency

Explanation: The main reason to implement caching in a cloud platform is to reduce data retrieving time or read latency making your application faster.

True or False: The AWS ElastiCache service supports only memcached.

Answer: False

Explanation: AWS ElastiCache supports two major open-source in-memory caching engines: Memcached and Redis.

Multiple select: Which types of caching are provided by AWS CloudFront?

  • A) Edge Caching
  • B) Object Caching
  • C) Distributed Caching
  • D) Browser Caching

Answer: A) Edge Caching, B) Object Caching, D) Browser Caching

Explanation: AWS CloudFront uses Edge caching, Object caching, and Browser caching but does not support Distributed caching.

Single Select: Which AWS service is best suited for caching session data?

  • A) AWS S3
  • B) AWS RDS
  • C) AWS ElastiCache
  • D) AWS EC2

Answer: C) AWS ElastiCache

Explanation: AWS ElastiCache is an in-memory data store and cache service, designed to retrieve data rapidly, making it ideal for caching session data.

True or False: AWS CloudFront supports only static content caching.

Answer: False

Explanation: AWS CloudFront supports both static and dynamic content caching.

Single Select: How can you invalidate cached content in AWS CloudFront?

  • A) By deleting the cache cluster
  • B) By updating deployment configurations
  • C) By using the CloudFront invalidation feature
  • D) By rebooting the edge location servers

Answer: C) By using the CloudFront invalidation feature

Explanation: In CloudFront, you can remove a file from all CloudFront edge locations before it expires by creating an invalidation.

Multiple select: Which of these caching strategies are supported in AWS ElastiCache?

  • A) Write-around cache
  • B) Write-through cache
  • C) Write-back cache
  • D) All of the above

Answer: D) All of the above

Explanation: AWS ElastiCache supports all these strategies – write-around, write-through and write-back cache for different application needs.

True or False: Implementing caching increases the application’s dependency on the network?

Answer: False

Explanation: Implementing caching actually reduces the application’s dependency on the network as it reduces the need to fetch data repeatedly over the network.

Single Select: What happens when the cache is full in AWS ElastiCache?

  • A) It will stop accepting new data
  • B) It applies a Least Recently Used (LRU) policy
  • C) It will generate an error
  • D) All of the above

Answer: B) It applies a Least Recently Used (LRU) policy

Explanation: When the cache is full, AWS ElastiCache employs an LRU (Least Recently Used) policy, removing old data to make room for new data.

True or False: Caching can help in saving database costs in AWS?

Answer: True

Explanation: Caching can save database costs by reducing the number of database reads, thereby lowering the required database throughput and size.

Single Select: Which AWS service is not suited for caching database queries?

  • A) AWS ElastiCache
  • B) AWS CloudFront
  • C) AWS DynamoDB DAX
  • D) AWS S3

Answer: D) AWS S3

Explanation: AWS S3 is a storage service not specifically suited for caching database queries. AWS ElastiCache and AWS DynamoDB DAX are more suitable for caching database queries.

Interview Questions

What is caching in the context of AWS?

Caching in AWS refers to storing replicas of data in locations that are closer to the end-user to decrease latency and increase the speed of data retrieval.

What AWS service is primarily used for caching?

AWS Elasticache is primarily used for caching in AWS.

What two caching engines are supported by AWS Elasticache?

AWS Elasticache supports two caching engines: Memcached and Redis.

What is the primary function of Amazon CloudFront in relation to caching?

Amazon CloudFront helps with caching by serving content to your viewers from the nearest edge location, reducing latency and improving download speeds.

If you need to flush all cached objects from Amazon CloudFront, what action would you take?

To flush all cached objects from Amazon CloudFront, you would create an invalidation.

What are cache behaviors in Amazon CloudFront?

Cache behaviors in Amazon CloudFront determine how it processes requests for your distribution’s files and determines which requests get served from the cache.

What kind of persistence is offered by the Redis backup option in AWS ElastiCache?

AWS ElastiCache for Redis offers both point-in-time backup persistence and snapshot persistence.

Which AWS service can be used as a query cache in a database tier?

AWS ElastiCache can be used as a query cache in a database tier.

Why would you implement caching on AWS?

Implementing caching on AWS improves application performance by reducing the latency of dynamic web applications and by storing responses to stateless requests.

What happens when a cached item in AWS ElastiCache expires?

When a cached item in AWS ElastiCache expires, it is removed from the cache to free up room for more data.

Can AWS ElastiCache automatically detect and recover from cache node failures?

Yes, AWS ElastiCache can automatically detect and recover from cache node failures.

What is the function of TTL (Time to Live) in AWS caching services?

The TTL is a setting that determines how long a response is kept in a cache. When the TTL expires, AWS caching services will delete the object from the cache.

How can AWS Elasticache improve read-heavy app performance?

AWS ElastiCache can improve read-heavy app performance by allowing you to retrieve data from in-memory caching system instead of relying on slower disk-based databases.

Can you encrypt your AWS ElastiCache data at rest?

Yes, you can. AWS ElastiCache for Redis gives the option to encrypt the data at rest.

Does AWS offer caching services for edge locations?

Yes, AWS offers Amazon CloudFront which caches copies of your content closer to your viewers at edge locations. This service reduces the number of requests made to your origin server and reduces latency.

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