What is DNS or domain name system?
<code>$ nslookup google.co.in</code>
<code>Server: 127.0.0.53</code>
<code>Address: 127.0.0.53#53</code>
<code>Non-authoritative answer:</code>
<code>Name:</code> <a target="_blank" href="http://google.co.in"><code>google.co.in</code></a>
<code>Address: 142.250.183.227 -&gt;IPv4 uses .</code>
<code>Name:</code> <a target="_blank" href="http://google.co.in"><code>google.co.in</code></a>
<code>Address: 2404:6800:4007:82a::2003 -&gt;IPv6 uses ::</code>
Key Take Away: DNS resolves a domain name to an IP address.
In Ubuntu Client Machine the first check is done in /etc/hosts file
<code>$ sudo nano /etc/hosts</code>
add a line in this file -&gt; <code>192.168.1.13 vayu-server</code>
<code>$ ping vayu-server</code> will automatically resolve to <code>ping 192.168.1.13</code>
Reference used:
<a target="_blank" href="https://www.youtube.com/watch?v=vUDJ-CAhnrs">https://www.youtube.com/watch?v=vUDJ-CAhnrs</a>
<a target="_blank" href="https://www.youtube.com/@StevenGordonAU">https://www.youtube.com/@StevenGordonAU</a>
<h3 id="heading-net-stat-command-to-check-the-connection">Net Stat command to check the connection:</h3>
<code>$ netstat -t -n</code>
<code>tcp 0 0 192.168.1.13:2222 192.168.1.13:50552 ESTABLISHED</code>
It has lot of useful features -&gt; explore using <code>$ man netstat</code>

What is DNS or domain name system?

`$ nslookup google.co.in`

`Server: 127.0.0.53`

`Address: 127.0.0.53#53`

`Non-authoritative answer:`

`Name:` [`google.co.in`](http://google.co.in)

`Address: 142.250.183.227 ->IPv4 uses .`

`Name:` [`google.co.in`](http://google.co.in)

`Address: 2404:6800:4007:82a::2003 ->IPv6 uses ::`

**Key Take Away: DNS resolves a domain name to an IP address.**

In Ubuntu Client Machine the first check is done in /etc/hosts file

`$ sudo nano /etc/hosts`

add a line in this file -&gt; `192.168.1.13 vayu-server`

`$ ping vayu-server` will automatically resolve to `ping 192.168.1.13`

**Reference used:**

[https://www.youtube.com/watch?v=vUDJ-CAhnrs](https://www.youtube.com/watch?v=vUDJ-CAhnrs)

[https://www.youtube.com/@StevenGordonAU](https://www.youtube.com/@StevenGordonAU)

### Net Stat command to check the connection:

`$ netstat -t -n`

`tcp 0 0 192.168.1.13:2222 192.168.1.13:50552 ESTABLISHED`

It has lot of useful features -&gt; explore using `$ man netstat`

Networking Fundamentals

Net Stat command to check the connection: