Software Engineering › Key terms › Y12 Programming for the Web › Content delivery network (CDN)
Content delivery network (CDN)
Term Y12 Programming for the Web
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 it is used 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.
Related past questions
- Familiarisation Q10 (4 marks): Load time Programming for the Web (Part C) · 4 marks
These are the questions the flashcard set links to this term. Open each one and compare your answer with its marking criteria.
Study links
- 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))
How to use it in an answer
A model sentence
“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
- Explain: Relate cause and effect; make the relationship between things evident; provide why and/or how. (Familiarisation Q10 (4 marks): Load time)
Technique for the question types
- Short answer: One clear point per mark, use the stimulus and course terms, and answer the command word.
- Multiple choice: Read all four options, rule out wrong ones, pick one; no penalty for guessing so never leave blank.
- Fill in the blanks: Choose the right word from a list; use exact syllabus terms.
What the marking guidelines and feedback say
Answers could include: if image-gallery.js loads slowly, add the 'async' attribute to the tag so it loads in parallel with the rest of the page.
Worked answers from the marking guidelines
Familiarisation Q10 (4 marks): Load time (4 marks): 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