Write down what you think of what you hear the word network.
Write down what you think the world wide web and Internet are. Is there a difference?
Explain what a network is
Be able to explain the difference between a LAN and WAN
Be able to describe transmission mediums
a group or system of interconnected people or things.
Pair up with someone in the class and think about the video you have just seen.
Think of three points that you have learned from this video.
Unfortunately, not everyone understands what the Internet is...
Examples of networks include:
The school network
Your home network
Networks can become very, very large. For example, the Internet is one of the largest networks serving almost 4.4 billion users as of 2019.
To be able to cope with this, rather than having a connection to each person’s individual computer, we use many smaller networks.
For instance, in your home you will probably have a small WiFi network that allows you to connect to the Internet.
Computers that are not on an network are called stand alone computers.
Computer networks are made up of multiple computers which all communicate using agreed protocols.
Each computer is given an IP address that allows the computer to uniquely identify itself.
Think of examples of computer networks around the world today.
There are two main type of network:
Local Area Network (LAN) - E.g. your home network or the school network
Wide Area Network (WAN) - E.g. The Internet
Advantages of LANs:
Advantages of WANs:
Image from jamiebalfour.scot provided by Jamie Balfour
The stages for sending data from one computer to another are:
Data is requested from the host computer (sender) by the user’s computer (receiver). The receiver tells the sender what it wants and tells the sender it’s IP address.
The sender packages the data into chunks or packets with the receiver’s IP address on them and sends them to the receiver at their IP address.
The receiver waits for the packets from the sender and rebuilds the data into the file
Firewalls are one of the most important forms of network security. A firewall checks incoming (and outgoing) packets before allowing them in or out of the network.
They check that the packets are following a set of rules. They are also used to set rules about which application or system should receive the packets.
Rules are created that take account of the following:
sender (source) IP address
receiver (destination) IP
Complete the questions in the worksheet
Prepare a short PowerPoint on networks. In this you should discuss LANs and WANs. You should also include firewalls.
Make sure to cover the key points that we went through today.
We will continue to build these PowerPoints as we continue with networks.