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Everyone that is my I have that here in the first lecture of this course I'm going to speak about it



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the Domain Name Service or what we normally you know as DNS so DNS works on port number 53 on both DC



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and UDP.



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And the function of the DNS is to map the domain name to IP address and vice versa.



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For example if you want to go to w w w Go to Facebook Dockum.



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Normally the networks are devices like Francos doesn't understand Facebook dot com so it needs to understand



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what is the IP address of the server or Facebook.



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In order to route the packet to that server.



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And that's why the NSA to map the domain name or Facebook to come to an IP address and then the router



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can route the packet to go to the server or Facebook.



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So that is the main idea of the DNS.



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Now on my take you can allow users to pass their DNS request through the router and the router by itself



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it will forward it to the DNS server.



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So I ended up coming up which is the first love I'm going to show you how you can enable that on that



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either.



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So how can you set the DNS on that other and allow the computers in your network to send their DNS traffic



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to the router so that either will allow those traffic to come via them.



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And also I'm going to show you how you can do the caching and side view of my thick router so that means



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that if you have many users who are visiting Facebook.



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So instead of every traffic to go to the DNS server the first user send the request to Facebook come



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to gosh this inside the cockpit.



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And then if the site didn't want to go to the same domain name then it will be directly mapped to the



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IP address.



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And also we show you how we can create static enemies inside the DNS.



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So if you want for example a domain name to have a static as you always for an IP address then you can



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add that on the microcosm.



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That is what I'm going to show you in the upcoming lab.



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It's going to be the first live and it's also a long glob.



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So let's go directly and start with.