
<h2>What is FQDN?</h2>
<p><strong>F</strong>ully <strong>Q</strong>ualified <strong>D</strong>omain <strong>N</strong>ame: sometimes also referred as an absolute domain name is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS).</p>
<h2>What is TLD?</h2>
<p><strong>T</strong>op <strong>L</strong>evel <strong>D</strong>omains.</p>
<h2>What is 8.8.8.8?</h2>
<p>Google DNS is a public DNS service that is provided by Google.</p>
<ul>
  <li><code>8.8.8.8</code>: the primary DNS server for Google DNS.</li>
  <li><code>8.8.4.4</code>: the secondary DNS server.</li>
</ul>
<p>CloudFlare's public DNS resolver: <code>1.1.1.1</code>.</p>
<h2>What is Multicast DNS?</h2>
<p>In computer networking, the multicast DNS (mDNS) protocol resolves hostnames to IP addresses within small networks that do not include a local name server. It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as unicast Domain Name System (DNS). It was designed to work as either a stand-alone protocol or compatible with standard DNS servers.</p>
<h2>What is SRV record?</h2>
<p>The DNS "service" (SRV) record specifies a host and port for specific services such as voice over IP (VoIP), instant messaging, and so on. Most other DNS records only specify a server or an IP address, but SRV records include a port at that IP address as well.</p>


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