Content delivery network (CDN)

Term

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Definition

A network of servers around the world that stores copies of files so users download from a nearby server.

Example: A CDN reduces latency.

Found in: school notes.

Where you'll use it in the test

Syllabus area: Y12 Programming for the Web.

Question types it can appear in

Short answer: Define, outline or explain it and tie it to the scenario.
Multiple choice: Pick the option that matches the definition or example.
Fill in the blanks: Choose this term to complete a statement or table.

Where it has appeared in the paper

Programming for the Web (Part C). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

“A network of servers around the world that stores copies of files so users download from a nearby server.” Then apply it: A CDN reduces latency.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

From the linked past questions

Explain: Relate cause and effect; make the relationship between things evident; provide why and/or how. (Familiarisation Q10 (4 marks): Load time)

Official worked answer

Familiarisation Q10 (4 marks): Load time (4 marks): official criteria and sample answer

Criteria

4: Explains how the load time of the web page can be improved. 3: Outlines how some issues affecting load time can be resolved. 2: Identifies issues affecting load time OR outlines how to resolve ONE. 1: Some relevant information.

Sample answer

The images can be resized to 640 x 480 beforehand so that the webpage does not need to load the large 4000 x 3000 images. The multiple CSS style sheets could be converted into a single .css file, reducing the number of HTTP requests the browser needs to send. If the "image-gallery.js" JavaScript file at the top of the source code loads slowly, it can be moved to the bottom just above so that it will not block the rest of the page from loading.

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Go deeper

Flashcard: Content delivery network (CDN) in Programming for the Web (Year 12) · study that set
Memorise: Web development system: front end, back end, databases
Notes: Methods to support and manage load times (Programming for the Web (Year 12))
Notes: Effect of big data on web architecture: data mining, metadata, streaming (Programming for the Web (Year 12))
Notes: Investigate the effect of big data on web architecture, including data mining, metadata,… (Programming for the Web (Year 12))
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Check yourself

Explain “Content delivery network (CDN)” in one sentence, give an example, and name a question type that could test it.

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