Domain name system (DNS)

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Definition

The service that translates a domain name (example.com) into an IP address. Port 53.

Example: DNS looks up the IP address for the site name.

Found in: syllabus, school notes.

Short version to memorise (key terms bank)

Domain name system: name to IP address (port 53).

Where you'll use it in the test

Syllabus area: Y12 Programming for the Web.

Question types it can appear in

Multiple choice: Pick the option that matches the definition or example.
Fill in the blanks: Choose this term to complete a statement or table.
Matching or table: Match it to its description, example or category.

Where it has appeared in the paper

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

How to use it

A model sentence

General advice, built from the definition and example above

“The service that translates a domain name (example.com) into an IP address.” Then apply it: DNS looks up the IP address for the site name.

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

Identify: Recognise and name. (2025 HSC Q6 (1 mark): Web protocols)

Go deeper

Flashcard: Domain name system (DNS) in Programming for the Web (Year 12) · study that set
Memorise: Applications of web programming: interactive websites, e-commerce, PWAs
Key terms bank entry: DNS
Notes: Investigate and practise how data is transferred on the internet, including data… (Programming for the Web (Year 12))
Notes: How data is transferred: packets, IP addresses, DNS (Programming for the Web (Year 12))
Notes: Web protocols and their ports (Programming for the Web (Year 12))
Full term page: every question, note and marking comment for Domain name system (DNS)

Check yourself

Explain “Domain name system (DNS)” in one sentence, give an example, and name a question type that could test it.

Reveal the answer

The service that translates a domain name (example.com) into an IP address. Port 53.

Example: DNS looks up the IP address for the site name.

Could be tested as: Multiple choice, Fill in the blanks, Matching or table.

Quick multiple choice

What is the main function of the Domain Name System (DNS)?

Translate domain names into IP addresses
Encrypt web traffic
Store the website's images
Check that HTML is valid

Show the answer

DNS is the internet's phone book: it maps names like example.com to IP addresses so packets can be routed.

Source: original (written for this study pack; not a NESA question). Open it in the multiple-choice bank.