Knowledge Check

Module 12: Caching Content - Knowledge Check

Question 1

What is caching?

• A way to store passwords
• An in-memory database
• A global network for content distribution
• A high-speed data storage layer ✓

Question 2

Which type of data should you cache?

• Dynamically generated web content
• Static data that is frequently accessed ✓
• Data that can be retrieved quickly with simple queries
• Specialized data that is needed by a subset of users

Question 3

Which is a benefit of caching?

• Decreased costs
• Increased application reliability
• Load balancing the application
• Reduced response latency ✓

Question 4

Which types of content on a web page can be cached using an edge cache? (Select TWO.)

• Shopping cart filled with a user’s item
• Dynamically generated content, such as a user’s name
• Web objects, such as hyperlinks ✓
• Video files, such as a product demo ✓
• User-generated data, such as search terms entered by user

Question 5

What does Amazon CloudFront enable?

• Transactional processing with an in-memory database
• Automatic creation of a time to live (TTL) value
• Bidirectional caching between users and an origin host
• Multi-tiered and regional caching of content ✓

Question 6

How does Amazon CloudFront use edge locations?

• It caches Regional data at Regional edge locations and delivers the content to clients through their Regional edge locations.
• It caches all content from an origin distribution at the edge location and delivers the content to clients through the fastest edge location.
• It caches frequently accessed content at edge locations. It delivers the cached content to clients through the edge location with the lowest latency to those clients. ✓
• It caches local content at edge locations. It delivers the cached content to clients through the edge location that requires the fewest network hops to reach those clients.

Question 7

Which statement describes an efficient way to deliver on-demand video content?

• Use Amazon S3 to store the content. Then use Amazon CloudFront to deliver the content. ✓
• Launch an Amazon EC2 instance to host and serve your video content.
• Launch an Amazon EC2 instance to host your video content. Then use Amazon CloudFront to deliver the content.
• Use Amazon S3 to store and serve the content.

Question 8

Which role does Amazon CloudFront play in protecting against distributed denial of service (DDoS) attacks?

• Controls traffic by the source IP addresses of requests
• Performs deep packet inspection to detect attacks
• Restricts traffic by geography to help block attacks that originate from specific countries
• Routes traffic through edge locations ✓

Question 9

How can an application use Amazon ElastiCache to improve database read performance? (Select TWO.)

• Write data to ElastiCache whenever the application writes to the database. ✓
• Read data from ElastiCache first, and write to ElastiCache when a cache miss occurs. ✓
• Read data from the database first, and write the most frequently read data to ElastiCache.
• Replicate the database in ElastiCache, and direct all reads to ElastiCache and all writes to the database.
• Direct all read requests to the database, and configure it to read from ElastiCache when a cache miss occurs.

Question 10

Which type of caching strategy should be used when there’s data that must be updated in real time?

• Time to live (TTL)
• Lazy loading
• Write-through ✓
• Cache-control headers