Pearson Edexcel International AS Level IT Student Book 1: Exhaustive Study Notes

Hardware and Software: Comprises physical (hardware) and software used in devices for various functions. Key characteristics include portability, performance, storage types (magnetic, SSD, RAID), user interface, connectivity (wired/wireless), and advanced features like sensors and processors.

Networks: Network components include NIC/WNICs, hubs, switches, routers, modems, and gateways, with wired (twisted pair, coaxial, fiber optic) and wireless transmission methods (microwaves, radio waves). Models include client-server and peer-to-peer, assessed by bandwidth, throughput, latency, and protocols like TCP/IP.

The Online Environment: Distinction between the Internet (infrastructure) and web (content); the importance of DNS for URL translation. Emphasizes digital footprints and cloud computing risks.

IT Systems: Comprise hardware, software, and processes. Visualization tools include data flow diagrams and flowcharts. Evaluation is based on systems' fit for purpose.

Data and Databases: Data vs. information, roles of relational databases, and SQL queries for data manipulation and extraction.

Wider Issues: Environmental impact from creation and disposal of tech, concerns of data protection, copyright, and the digital divide.

HTML & CSS: Key HTML structure, block vs. inline vs. semantic elements, CSS styling and implementation methods, positioning, and layout styling with box models and animations.

JavaScript: Manipulating the DOM, programming logic with variables and data structures, event handling, and error management.

Semantic Web: Shift from non-semantic to meaningful markup, impacting SEO and accessibility.