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NSWInformation Processes and TechnologyQuick questions
Core: Communication Systems
Quick questions on Examples of communication systems in HSC Information Processes and Technology
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What is the client server model?Show answer
Many communication systems use the client server model: a client (a browser, mail program or app) sends a request, and a server (a powerful, always-on computer) processes it and returns a response. The server centralises data and services; clients are lightweight and numerous. Some systems instead use peer to peer, where each device acts as both client and server, sharing directly without a central server.
What is email?Show answer
Email is a store and forward system. The sender's client passes the message to a mail server using SMTP (Simple Mail Transfer Protocol), which relays it server to server until it reaches the recipient's mail server, where it is stored. The recipient later retrieves it using POP (which downloads) or IMAP (which keeps it on the server and syncs). Email is asynchronous: the recipient need not be online when it is sent.
What is electronic data interchange?Show answer
Electronic data interchange (EDI) is the automatic exchange of structured business documents, such as purchase orders and invoices, directly between the computer systems of trading partners in an agreed standard format. Because the documents are structured and machine readable, no re-keying is needed: one company's order becomes another's sales record automatically, reducing errors, delay and cost. EDI is a backbone of supply chains.
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