07 Content Delivery Networks Overview
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07 Content Delivery Networks Overview

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Questions and Answers

What is a primary benefit of using a content delivery network (CDN)?

  • It ensures that content is delivered from data centers close to users. (correct)
  • Users receive content from servers far away.
  • It eliminates the need for DNS resolution.
  • It minimizes the need for content updates.

    • Which type of CDN requires the user to upload content directly to the CDN?

  • Push CDN (correct)
  • Pull CDN
  • Hybrid CDN
  • Dynamic CDN

    • What is a disadvantage of using pull CDNs?

  • They require frequent manual updates.
  • They are more costly than push CDNs.
  • They only serve dynamic content.
  • They can lead to stale content if not managed appropriately. (correct)

    • Which type of CDN is more suitable for sites with heavy traffic?

    <p>Pull CDN</p> Signup and view all the answers

    How does a pull CDN handle content requests from users?

    <p>It retrieves content only after a user requests it for the first time.</p> Signup and view all the answers

    What is the role of DNS resolution in a CDN setup?

    <p>It tells clients which server to contact.</p> Signup and view all the answers

    Which statement about content updates in push CDNs is true?

    <p>Content is uploaded only when it is newly created or altered.</p> Signup and view all the answers

    What is a time-to-live (TTL) in the context of pull CDNs?

    <p>The time a content is cached before it is re-fetched from the server.</p> Signup and view all the answers

    Study Notes

    Content Delivery Networks (CDNs)

    • A CDN is a globally distributed network of proxy servers.
    • CDNs serve content (HTML, CSS, JavaScript, photos, videos) from locations closer to the user.
    • Some CDNs support dynamic content, like Amazon CloudFront.
    • A site's DNS resolution tells clients which server to contact.

    CDN Performance Improvements

    • Users receive content from data centers close to them.
    • Servers don't have to handle requests fulfilled by the CDN.

    Push CDNs

    • Push CDNs automatically update content on the CDN whenever changes occur on the origin server.
    • The site owner manages content updates, uploads, and URL rewrites.
    • Suitable for sites with low traffic volumes and infrequently updated content, maximizing efficiency by serving up-to-date content.

    Pull CDNs

    • Pull CDNs deliver content only when a user requests it; the content remains on the origin server.
    • URLs are rewritten to point to the CDN; this results in slower initial requests.
    • Time-to-Live (TTL) values dictate how long cached content remains valid.
    • Suitable for sites with high traffic and frequently updated content. Traffic is spread more evenly, ensuring the most recently accessed content is available.

    CDN Disadvantages

    • Costs can be significant, depending on traffic.
    • Content might be outdated if updated before the TTL expires.
    • Changing URLs for static content is needed.

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    Content Delivery Networks (CDNs): A Guide

    Description

    This quiz covers the fundamental concepts of Content Delivery Networks (CDNs), including their structure, performance improvements, and the differences between push and pull CDNs. Gain insight into how CDNs enhance content delivery and optimize user experience.

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