Networks and the Internet
What's covered
Key facts
Client and Server
A web browser acts as a client when it asks a web server for a page.
IP Addresses and DNS
DNS stands for Domain Name System and acts like an internet phonebook.
LAN vs WAN
The Internet is the largest WAN — in fact a global "network of networks".
The Internet — How it Works
Data sent over the Internet is split into packets, each routed independently to the destination.
The World Wide Web — Pages, URLs, Browsers
A web browser is a program used to view web pages (e.g. Chrome, Firefox, Edge, Safari).
What is a Computer Network?
A computer network is two or more computers (or devices) connected together so they can share data and resources.
Wired and Wireless Networks
Wi-Fi signals are weakened by walls, distance, and other electronic interference.
Client and Server
A client is a computer (or program) that requests a service from a server.
IP Addresses and DNS
DNS (Domain Name System) translates domain names like google.com into the IP address of the right server.
LAN vs WAN
LAN stands for Local Area Network.
Sample questions
A taste of the 62 questions in this topic, answers marked. Sign up to practise the full set with spaced repetition.
What is a client in networking?
- •Computer providing a service
- ✓Computer requesting a service
- •Device that routes data between networks
- •Machine that stores shared files centrally
What does DNS do?
- •Assigns a temporary IP address to a new device when it joins a network
- •Encrypts traffic between a web browser and a website so it cannot be read in transit
- •Stores cached copies of web pages so they load faster on a repeat visit
- ✓Translates domain names into IP addresses computers use to find each other
What does LAN stand for?
- •Large access node
- •Linked application network
- ✓Local area network
- •Wide area network
How do devices on the Internet find each other?
- •Using a phone call
- ✓Using IP addresses
- •Using postal letters
- •Using the home address
What is the name of the system of linked web pages accessed over the internet through a browser?
- •Domain Name System
- •HTTP protocol
- •The internet
- ✓World Wide Web
What is a computer network?
- •A collection of programs on one machine
- •A single computer connected to the internet
- •Software that manages file storage
- ✓Two or more linked computers
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