Original subtitles

In this video, we're going to discuss binary binary is a fundamental building block in networks today.

You need to understand binary if you want to be able to work with networks.

It's used in multiple places.

Now, don't worry if you don't know what this means.

We'll explain it later in the course.

But just be aware that you need to know binary to work with access lists or access control lists that

allow you to permit or deny traffic based on an IP address.

When you configured devices in your network with various IP addresses, you may want to permit one device

to talk to another device, but then deny a third device from talking to that second device.

Now, to do that, you permit or deny traffic based on a IP address, whether that's a source IP address

or a destination IP address.

You're going to match specific IP addresses based on a binary representation.

Computers, networking devices and machines use binary.

That's what they understand.

We may use English or another language to communicate.

But machines use binary.

And for you to implement things like access control lists in a network or something like a subnet mosque.

So determining what a subnet mosque is for a specific network, you need to understand binary.

So make sure that you don't skip the section.

If you don't know the answer to this question.

I've seen this printed on many t shirts.

So if you don't know the answer to those questions, then don't skip the section.

There are only one zero types of people in the world, those that understand binary and those that don't.

How would you read that?

Would you read that number as one zero as in 10?

Or would you read it as two if you understand this joke?

You probably want to skip this video, the section and go to the next section, but make sure that you

know how to convert IP addresses as a dotted decimal.

IP addresses to binary.

If you're not sure what I'm talking about, you don't understand this joke.

Don't worry that one zero means two in binary.

So the joke is there are only two types of people in the world, those that understand binary and those

that don't.

If you didn't get the joke.

Don't worry.

By the end of this video, you'll understand this joke and understand where the one zero comes from.

Now, as an analogy, to help us understand binary, let's use the analogy of electricity, because

computers, let's be honest, they have chips in them rather than switches, have specific types of

chips known as a sex or application, specific integrated circuits.

It's basically a circuit.

So computers have circuits and they run on electricity.

In electricity.

We either have two states.

Something is on as in this current or power to the device or it's off.

So as an analogy, I notice that big like there, that's an old antique lamp.

But I've put a huge bold in that lamp.

So that's on.

That's off no power.

On those power.

That's of no power.

That's on on means.

Current is applied off means current is removed, so a computer basically only has two states, current

or no current, on a circuit that.

However, let me turn that back on again.

That, however, gives us two states.

So one cable gives us two states.

So remember this.

All computers function by using a system of switches that can either be on or off.

Off equals zero.

On equals one are binary values or either zero or one.

So once again, our analogy.

That's one.

That's zero one zero.

I won't bore you too much during that.

The moral of the story is make sure you understand that binary consists of two states or two values.

Zero one.

That becomes really important now as we scale this analogy.