Identify each in the following types of communication. Also identify security and error control if applicable.
A network can be defined as a combination of hardware, software and cabling, which together allow multiple computing devices to communicate with each other. Below we see an example of a network. In the diagram we see computers, a server, a printer, and a cloud. The cloud contains some stuff that isn't important to us at this point. The server is there to provide services to the users. This is an example of a small network.
As you can see from the image above there is a lot that is unknown about this network. Throughout the course we will be revealing more and more detail about the network, both physically and logically.
There are other times when you know you're using the network. When you post a message on Facebook you know people will see that message from their own devices. They won't have to use your device to see the message. The message travelled over a network to Facebook's server.
You know when you are downloading or uploading files you are using the network to transfer the data. Downloading is getting a file from a network source. Uploading is putting a file onto a network destination.
There are other times when you may use a network and not even realize it. If you walk into a computer lab and sit down at a computer next to a printer. When you print you may not know if that print job went over the network, or a USB cable. You probably don't care either way, you just grab your print job and go.
Another time you may use the network and not know it is when you save a document. If you save it to your Documents folder you may think you're saving it to the local disk, but in reality you're saving it to the server. All you know is your data is there when you want it, so you don't care where it is.
These are examples of using the network either on purpose, or by accident. Sometimes you know you're using the network, sometimes you don't.
Networks come in many different shapes and sizes, we will look at a couple of other example before we go any farther.
LAN - Local Area Network
The small network that we have been looking at is a Local Area Network, or a LAN. The LAN has a few characteristics such as:
WAN - Wide Area NetworkWhen you have a need to span your network over a larger area you create a Wide Area Network, or a WAN. A WAN is a way to connect LAN's that are far apart. A WAN has the following characteristics: