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In this video, we're going to discuss Binary

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I'd like to explain how binary works

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I’d like to show you some tricks relating to binary and IP addresses

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So for example, how to convert a dotted decimal IP Address

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to a binary number and back again

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Binary is a basic building block in networking and it's really important

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that you understand how binary works, you'll encounter binary

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over and over again throughout you networking career

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So in this section, we'll cover the reasons why you should be learning binary

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and I've already mentioned a few good reasons

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I'd like to give you an overview of binary and explain the basics of binary

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and then lastly I'd like to show you how to convert an IP Address to binary

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and then translate it back again

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This is very similar to translating from one language to another

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so for example, translating English to French

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but in this case, we're taking a dotted decimal IP address and

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converting it to binary format and then converting it back again

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So let's get started!

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Binary is of great importance once again in networking

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you're going to encounter binary when doing IP Subnetting

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for example or when configuring Access Lists to permit or deny

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certain IP addresses or certain subnets

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You cannot be a good Network Engineer if you don't understand

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IP addressing and subnetting and therefore a knowledge of binary is required

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as you'll be using it again and again

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As an example, you may have a subnet of 10.1.1.0/24

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and you may need to subnet that again to 10.1.1.0/28

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without a good understanding of binary, it will be very difficult

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to do subnetting or to work with Access Control Lists which use inverse masks

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so 0.0.0.255 is the inverse of 255.255.255.0

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once again without a fundamental understanding of binary

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it will be very difficult to do both subnetting and Access Lists

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and various other tasks in networking

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All computers function by using a system of switches that

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can either be set on or set off

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an off value is denoted as a 0 and on value is denoted as a 1

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So binary is actually a really simple language all you have to understand

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is that you have 2 options or 2 values and those values are either 0 or 1

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Decimal, for instance, has values 0 to 9 but in binary it's always either 0 or

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There are only those  two values that you need to understand

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I just wish learning a foreign language was as simple as this language

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which contains only two words or two values once again 0 or 1

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As an example a 128 in decimal = 10000000 in other words 1 followed by 7 0s

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in binary and I'm going to explain in a moment how I got to that value

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but notice it's either 1s or 0s

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These values will be used in combinations but essentially everything

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in binary boils down to either a 0 or a 1

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So to help you understand how binary let's use the following analogy

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imagine a cable, that cable can either have current or not have current

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So when there’s current on the cable that equates to a 1

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when there’s no current that equates to 0

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So single cable can have 1 of 2 states it can either have current

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or not have current.When current is applied the value would be 1

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and when no current is applied the value would be 0

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So a single cable when there's no current = 0

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and when there's current = 1

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This cable can be in 1 or 2 states, it can either have current

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or not have current and that gives us 2 combinations or 2 options

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either 0 or 1, meaning no current or meaning current