<p>I executed the <code>kubectl get nodes -o wide</code> command, and in the results, there is a column labeled INTERNAL-IP, which displays the internal IP for each node. I would like to understand if the nodes use this IP to communicate with each other and with the control plane (master node) as well.</p>
<p>Additionally, what role does Calico play in this particular scenario?</p>

Dev OV
<p>So a kubernetes cluster is basically setup like a network. Every node/pod gets its own internal ip address and it's own entry in the kube-dns! All nodes and pods can communicate with each other over the given ip addresses (it doesn't matter if its a master node or not) or hostname.</p>
<p>If you use Calico it implements a more advanced networking model using the BGP Protocol (<a href="https://www.ibm.com/docs/fr/cloud-private/3.1.1?topic=ins-calico" rel="nofollow noreferrer">more detailed information about Calcico</a>)</p>
<p>Calcico also brings some other features like:</p>
<ul>
<li>more possibilities to define network policy's</li>
<li>more advanced security features</li>
<li>especially designed for large scale deployments</li>
<li>ip address management solutions can be used, for greater control over ip allocation</li>
</ul>
