Availability

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Definition

Authorised users can access the data and system when needed; supported by backups, redundancy and protection against denial of service.

Example: A backup server keeps the site available if the main one fails.

Found in: syllabus, 2025 HSC marking guidelines, school notes.

Short version to memorise (key terms bank)

Systems and data are accessible when needed.

Where you'll use it in the test

Syllabus area: Y12 Secure Software Architecture.

Question types it can appear in

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

Where it has appeared in the paper

Secure Software Architecture (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

“Authorised users can access the data and system when needed; supported by backups, redundancy and protection against denial of service.” Then apply it: A backup server keeps the site available if the main one fails.

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.

Go deeper

Flashcard: Availability in Secure Software Architecture (Year 12) · study that set
Memorise: Fundamental software design security concepts (six words)
Key terms bank entry: Availability
Notes: When developing programming code, explore fundamental software design security concepts,… (Secure Software Architecture (Year 12))
Notes: Fundamental software design security concepts (six words) (Secure Software Architecture (Year 12))
Notes: Test and evaluate security and resilience (Secure Software Architecture (Year 12))
Full term page: every question, note and marking comment for Availability

Check yourself

Explain “Availability” in one sentence, give an example, and name a question type that could test it.

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