← Digital Solutions syllabus

QLDDigital Solutions

Unit 4: Digital impacts

10 dot points across 10 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How are the requirements of a complex, secure data exchange identified and specified?

Identify and specify the functional, security and data requirements of a complex data exchange problem, including the systems involved, the data exchanged and the conditions for reliable exchange
A focused answer to the QCE Digital Solutions Unit 4 dot point on data exchange requirements. Identifying the systems and data involved, specifying functional and security requirements, defining reliability and validation conditions, and scoping a complex exchange for IA3.
6 min answer →

How and why is data compressed for storage and transmission between digital systems?

Explain how lossless and lossy data compression reduce the size of data for efficient storage and transmission, and the trade-offs each makes
A focused answer to the QCE Digital Solutions Unit 4 dot point on compression. The difference between lossless and lossy compression, how run-length and dictionary methods work, common formats, and the trade-offs between size, quality and speed in data exchange.
6 min answer →

How are the design of a data exchange and its algorithms represented before they are built?

Represent the design of a data exchange using data exchange diagrams, IPO tables and pseudocode to communicate how data moves and is processed between systems
A focused answer to the QCE Digital Solutions Unit 4 dot point on design representation. Data exchange diagrams, IPO (input-process-output) tables, pseudocode for exchange algorithms, and how these tools communicate a prototype design before coding.
6 min answer →

How is data exchanged between digital systems across networks?

Explain how data is exchanged between digital systems using structured formats such as JSON and XML, application programming interfaces (APIs) and network protocols, and the conditions required for reliable exchange
A focused answer to the QCE Digital Solutions Unit 4 dot point on data exchange. Structured data formats (JSON and XML), APIs and HTTP requests, network protocols, and the conditions for reliable, interoperable exchange between digital systems as required for IA3 prototypes.
6 min answer →

How is data kept secure as it is stored and exchanged between digital systems?

Explain and apply data security techniques including encryption (symmetric and asymmetric), hashing, authentication and secure transmission to protect data confidentiality, integrity and availability
A focused answer to the QCE Digital Solutions Unit 4 dot point on data security. Symmetric and asymmetric encryption, hashing, the CIA triad, authentication and HTTPS, and how QCAA expects you to secure a data exchange solution in IA3.
6 min answer →

How do hashing and checksums verify that exchanged data has not been altered?

Explain how hashing, checksums and authentication are used to verify the integrity and authenticity of data during storage and transmission
A focused answer to the QCE Digital Solutions Unit 4 dot point on integrity verification. What a hash function is, how checksums detect transmission errors, how hashing verifies integrity and stores passwords, and how this differs from encryption.
6 min answer →

How do network protocols move data reliably between digital systems?

Explain how network protocols, including TCP/IP and HTTP/HTTPS, package, address, route and reassemble data so that it is transmitted reliably between digital systems
A focused answer to the QCE Digital Solutions Unit 4 dot point on protocols. The role of protocols, the TCP/IP model, packets and addressing, HTTP and HTTPS, and how layered protocols deliver reliable data exchange between systems.
6 min answer →

What are the privacy, legal and ethical impacts of storing and exchanging personal data?

Evaluate the privacy, legal and ethical impacts of collecting, storing and exchanging personal data, applying privacy principles and considering the social consequences of digital solutions
A focused answer to the QCE Digital Solutions Unit 4 dot point on data privacy and ethics. Australian Privacy Principles, data minimisation and consent, legal obligations, ethical evaluation of digital impacts, and how QCAA expects you to weigh social consequences in IA3 and the EA.
6 min answer →

How is a prototype digital data exchange developed, tested and evaluated?

Develop, test and evaluate a prototype that exchanges data between digital systems, applying iterative development, validation and a structured test plan against the solution requirements
A focused answer to the QCE Digital Solutions Unit 4 dot point on prototyping data exchanges. Iterative development, building and parsing an exchange, input validation, structured test plans with normal/boundary/error cases, and how QCAA expects you to evaluate a prototype in IA3.
6 min answer →

How is a data exchange prototype tested and evaluated against its requirements?

Design and apply testing strategies, including test data and test cases, to verify a prototype against its requirements, and evaluate the solution using justified criteria
A focused answer to the QCE Digital Solutions Unit 4 dot point on testing and evaluation. Test cases and test data (normal, boundary, abnormal), the types of testing, evaluation against criteria, and how testing differs from evaluation in IA3.
6 min answer →