What problem does DNS solve?

DNS solves the mismatch between how people think and how computers work on a network.

In simpler terms: people need names, while computers need IP addresses.

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#What exactly is the problem

#Without DNS it would look like this:

• sites would only have IP addresses

  142.250.184.206

• to open a site, you would have to memorize and type the IP

• when the IP changed, the site would "break" for everyone

This is:

• inconvenient
• impractical
• not scalable

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#What problem DNS solves

#1. Makes the internet convenient for people

DNS lets you use understandable names:

• google.com
• example.com

Instead of strings of digits.

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#2. Separates a site's name from its IP address

A site can:

• move to another server
• change its IP address
• use several IPs

The user will not notice anything, because the name stays the same.

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#3. Lets the internet scale

DNS is:

• a distributed system
• has no single "main server"
• supports millions of sites

Without DNS, managing so many addresses would be impossible.

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#4. Simplifies administration

An administrator:

• changes the IP in DNS
• does not change links, applications, or bookmarks

This is critical for business and infrastructure.

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#Short example

The user enters:

example.com

DNS solves the problem:

"Which IP does this name correspond to?"

And responds:

93.184.216.34

From there the browser works by IP.

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#Real-life example

DNS is like a contact list in a phone:

• you pick a name
• the phone substitutes the number
• if the number changes, you still call by name

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#Short interview answer

Remember this formulation:

DNS solves the problem of translating domain names, which are convenient for humans, into IP addresses used by computers to communicate on a network, thereby making the internet convenient and scalable.