Content delivery with CDN in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the primary purpose of a CDN in content delivery.

HLD

A CDN primarily helps to [1] content closer to users.

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Acache

Bdelete

Cencrypt

Dcompress

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'delete' or 'encrypt' which are unrelated to CDN's main function.

A CDN caches content on servers near users to reduce latency and improve load times.

2fill in blank

medium

Complete the code to show the step where user requests are directed to the nearest CDN server.

HLD

When a user requests content, DNS [1] directs the request to the closest CDN edge server.

Drag options to blanks, or click blank then click option'

Arouting

Bcaching

Ccompression

Dencryption

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing routing with caching or compression.

DNS routing helps direct user requests to the nearest CDN edge server for faster content delivery.

3fill in blank

hard

Fix the error in the description of CDN cache invalidation.

HLD

CDN cache invalidation is the process of [1] outdated content from edge servers.

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Aduplicating

Bupdating

Cremoving

Dencrypting

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'updating' which is not the exact process of invalidation.

Cache invalidation means removing outdated content so fresh content can be served.

4fill in blank

hard

Fill both blanks to complete the CDN request flow correctly.

HLD

User requests content -> DNS [1] -> CDN edge server [2] content if cached -> origin server if not cached.

Drag options to blanks, or click blank then click option'

Arouting

Bcompresses

Cserves

Dencrypts

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up compression or encryption with serving content.

DNS routing directs requests; CDN edge servers serve cached content to users.

5fill in blank

hard

Fill all three blanks to complete the CDN cache control logic.

HLD

Cache-Control header: max-age=[1], must-revalidate=[2], proxy-revalidate=[3].

Drag options to blanks, or click blank then click option'

A3600

Btrue

Cfalse

D7200

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing true/false values for revalidation flags.

max-age sets cache duration; must-revalidate true forces revalidation; proxy-revalidate false allows proxy caching without revalidation.