Different types of operators
Arithmetic operators +, -, *, /, % Arithmetic operators perform common mathematical operations on values. ‘%’ is for modulo (remainder after division). Example: 5 % […]
Year 11 Semester 1
Framework for Software Development
Investigate Phase Design Phase Develop Phase Evaluate Phase
Factors that affect network performance
Bandwidth Bandwidth is the maximum data transfer rate of a network connection over a period of time. Bandwidth is measured in bits per second (bps, […]
WiFi versions
WiFi, otherwise known at the 802.11 protocol, has had 18 versions. This page covers just four and compares the frequencies, theoretical bitrate, and security aspects. […]
DHCP and DNS
Dynamic Host Configuration Protocol (DHCP) Every device on a network needs a unique IP address. While these addresses can be manually assigned that is not […]
Error detection and correction
When sending data over a network there is a possibility of interference and therefore errors occurring in the data. Here are two methods of detecting […]
TCP/IP Model
Transmission Control Protocol / Internet Protocol (TCP/IP) is a set of communication protocols which specify how data is transferred across networks (and therefore the internet). […]
Variables – local, global, and parameter
Local A local variable is only available to the module (or block of code) it is within. That is its “scope”. The variable total is […]
Encryption
Transferring data over networks is inherently insecure. The traffic passes through multiple routers and if any of those routers are compromised by a hacker or […]
Programming Control Structures
The code below is Pseudocode. Sequence Sequence is each statement after another. x = 0 OUTPUT (“Hello world”) are examples. Selection When a decision needs […]