Original subtitles

What is DNS?

Due to the proliferation of the internet, browsing to websites from our computers, phones or tablets

is now an integral part of our daily lives.

And all it involves is typing the right benign name into our browser for easy shopping.

We browse to sites like W-, W- W-, Amazon.com or WW Dot eBay.com for online banking.

We navigate the websites such as W, WW Dot, Bank of America Dot Com, and to watch some of the latest

movies we visit the likes of WW W Dot Netflix dot com.

The entire experience of surfing the Web basically involves browsing two domain names, such as the

ones mentioned as they are easy for us humans to remember.

The problem is, however, that unlike humans, computers work with numbers since each device connected

to the internet has a unique IP address, which other machines use to find it.

What this means is that though we can browse the website by typing its IP address in our browser, we

cannot do the same with domain names unless we use a specific supporting mechanism designed to translate

domain names to IP addresses.

And this is where DNS comes in.

DNS stands for domain name system, and it is the underlying protocol that acts as the intermediary,

allowing for the translation of domain names such as WW W Dot, BBC Decoder UK to the IP address or

addresses that belong to the computer system hosting the actual contents that we as the end users want

to access.

This is why dance is often referred to as the phone book of the internet, in that it works in a very

similar way to a conventional phone book where we perform a lookup against the name with a goal to get

its associated numeric address.

In other words, VNS makes the link between the action of typing a domain name into a browser and reaching

the computer system, which hosts the desired content without DNS.

We would need to know the IP address of the site we wish to browse to, such as 0:55, though 23 eight

nine.

If it's an IP before address or more complex alphanumeric IP addresses such as two four zero zero column

C. B. zero zero column two zero four eight column one column column C six to nine column D7 A2 if it's

an IP address.

Needless to say, this is not practical at all, even for technical individuals.

And so DNS has been created with the aim of eliminating the need for humans to memorize IP addresses

and instead use human friendly domain names while browsing.

In summary, without DNS, we will not be able to use the internet as we do today without being said,

DNS is a lot more complicated than a phone book, and its versatility has gone beyond the task of translating

domain names to IP addresses.

The protocol steps and sophistication would become more apparent as we progressed through the course.

I would love to take a moment to thank you again for running this course designed to teach you everything

you need to know about one of the most important internet protocols out there, taking you from the

status of newbie to expert.

Along the way.