Original subtitles

Now in this course we're going to use a lot of terms that may be new to you if you're not sure about

any of the terms that I'm using in this course or you would simply like more explanation please feel

free to send me a message and I'll either answer it through the messages or create a new video explaining

the terms in more detail.

The first one to start off with is a network interface card or Nick.

This is also called a network interface controller network adapter LAN adapter or local area network

adapter or physical network interface.

This is essentially a computer hardware component that connects a computer or a device such as an iPad

to a computer network.

In this example we are connecting to a physical network.

So our computer is connected via a cable plugged into a network interface called on Nic to give it access

to the network more and more these days.

We have a wireless network interface cards that connect us to networks running in the air rather than

copper or fiber cabling computer networks allow us to connect to Web sites on the Internet.

You may have connected to many web sites on the Internet and just taking it for granted that those Web

sites are available from almost any way in the world.

In this example I'm connecting to Facebook in California from the United Kingdom complex networks such

as the internet enable this ability but in its most basic form what is a network at its most basic level

a computer network could simply be two computers connected via cable.

Sharing information with each other you may have a file on a PC as an example and want to share that

with someone else.

So you could connect to devices such as a laptop and PC using what's called an ethernet cable to the

network interface cards or interface adapters on the computers and allow them to change for motion with

each other.

That's all a computer network is.

In its simplest most basic form it's essentially two devices sharing information with each other.

What is a network protocol.

Well a network protocol is essentially a set of rules and conventions that governs the communications

between network devices.

Also as an example between computers on a network in order for two computers to talk to each other as

an example they must be speaking the same language.

If I only speak English and you only speak French we're not going to communicate effectively in the

same way when two computers communicate with one another.

There needs to be a set of rules governing how those computers exchange data and effectively communicate

with one another in our everyday lives.

We follow guidelines or rules when we communicate with one another.

As an example when you drive on the road you follow a set of rules when a traffic light is green means

go when it's red it means stop.

Now in networking there are many types of networking protocols and standards to ensure that computers

can effectively communicate with other devices which may be right next to them.

On the other side of the world later in this course you'll learn about the oocyte model or open systems

into connection reference model which defines seven layers of networking protocols.

For now simply understand that a network protocol is essentially a language that governs the communications

between networking devices.