ACARA Digital Technologies Years 9–10 Definitions Worksheet: Networked Systems and Access Control and Content, Structure and Presentation (Modules 116–154)
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Date:
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Key terms
Write what each term means, in your own words.
1
rwxr-x---
2
network firewall
3
allow inbound TCP 443
4
deny from 192.168.1.50
5
default deny
6
MAC filtering
7
access control
8
JavaScript
9
web page layers
Answer Key
ACARA Digital Technologies Years 9–10 · Modules 116–154 · Student wording will vary for definitions
1rwxr-x--- — Three groups of three letters for owner, group and others: r is read, w is write, x is execute and - means not allowed. Here the owner has rwx, group r-x, others nothing.
2network firewall — A device or router feature between a local network and the internet that filters inbound and outbound traffic for every device behind it, not just one.
3allow inbound TCP 443 — A firewall rule with an action (allow), a direction (inbound) and a port (TCP 443). It lets incoming web traffic through. A deny rule on a port, such as 23, blocks it.
4deny from 192.168.1.50 — A firewall rule that blocks traffic from one IP address. Use a range like 192.168.1.0/24 to match a whole network, and allow to let only trusted addresses, such as the school network, in.
5default deny — A firewall checks rules from the top and uses the first match. A final default deny rule blocks anything not allowed by an earlier rule.
6MAC filtering — A router setting that only lets devices with MAC addresses on an allowed list join. It is easy to set up but weak, because a MAC address can be copied (spoofed).
7access control — Naming the data to protect, then choosing controls like login, permissions, a firewall or encryption, and justifying each one with the risk it reduces.
8JavaScript — The programming language that adds behaviour to a web page, such as reacting to a click, on top of its HTML content and structure and its CSS presentation.
9web page layers — Every part of a page is content (words, images), structure (tags), presentation (CSS colour, layout) or behaviour (JavaScript). Each layer can be changed on its own.