The Internet is a global network of interconnected computer networks. Key concepts include DNS, hosting, the cloud, and the client-server model used by web servers and clients.
Key points
Definition:The Internet: a worldwide network of smaller computer networks, allowing devices around the world to communicate and share data.
The Internet uses the client-server model: web servers store and provide web pages; clients (browsers) request and display them.
Key Internet services include DNS (translates URLs to IP addresses), web hosting (storing websites on servers), and cloud computing.
Exam Tip:The Internet is a NETWORK OF NETWORKS — it is not just 'the web'. The World Wide Web is a service that runs ON the Internet.
Exam Example:Fill-in: 'A website is hosted on a WEB SERVER. Computers accessing it are CLIENTS. The user enters a URL into a browser, which queries the DNS for the matching IP address.'
Exam Tip:IPv4 addresses use groups between 0 and 255, separated by FULL STOPS (dots). NOT colons, NOT hyphens. 256 is too high.