Chapter 23: The Internet And The World Wide Web Flashcards
(26 cards)
What is the Internet?
A global network of interconnected networks that spans the globe and supports services like the World Wide Web and email.
What is the World Wide Web (WWW)?
A collection of websites & web pages accessed using the Internet
How is the Internet different from the WWW?
The Internet is the infrastructure; the WWW is a service on it used to access web pages.
What is a domain name?
A human-readable address used to identify IP addresses, e.g., bbc.co.uk.
What is DNS (Domain Name System)?
A service that translates domain names into IP addresses so browsers can load Internet resources.
How does DNS work?
A DNS server looks up a domain name in its database and returns the IP address. If not found, it asks another server.
What is an ISP?
An Internet Service Provider, an organization that provides access to the Internet.
What is TCP/IP?
A protocol stack used to manage communications across the Internet.
What does the IP protocol do?
Provides unique addressing for devices on a network to send/receive data.
What is IPv4?
An older IP version using 32-bit addresses, providing about 4 billion unique addresses.
What is IPv6?
A newer IP version using 128-bit addresses, allowing for vastly more unique addresses.
What is a router?
A device that receives & forwards data packets between different networks & connects a network to the Internet
How does a router work?
It reads packet headers and uses its routing table to forward them to the correct destination.
What is a switch?
A network device that connects computers in a LAN and forwards data only to the intended recipient.
How does a switch work?
It uses a table of device addresses to send data only to the correct computer, reducing traffic.
What is a wireless access point (WAP)?
A device that allows wireless devices to connect to a wired network using Wi-Fi.
What is a modem?
A device that converts digital signals from a LAN to a format suitable for transmission via an ISP’s medium.
What is a URL?
A Uniform Resource Locator, which is the web address of a resource on the WWW.
How does accessing a web page work?
A user enters a URL; DNS resolves it to an IP; the browser requests data via HTTP/HTTPS; the server responds with HTML.
What is HTML?
HyperText Markup Language, used to structure and display content on web pages.
What is hypertext?
Text with hyperlinks that connect to other web pages or documents.
How does a web browser work?
It sends requests to web servers and displays received data in a readable format.
What are some common Internet services?
The World Wide Web and email.
Why are routers used at home?
To connect multiple devices to the Internet and direct incoming data to the correct device.
