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In the lab setup, what we want, we want to launch www.example1.com, www.example2.com www.

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example3.com, all on 172.24.0.1.

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That mean we are using one address for three sites.

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So this is called name based virtual hosting.

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Now please remember whenever you have to implement the name based virtual hosting, we need properly

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configured DNS server.

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What is the role of DNS server, because it is the DNS server which is going to resolve this example

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1.com, example2.com, example3.com to ipaddress 172.

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This is the role of DNS, since we are not implementing the DNS server because the DNS is again one

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full fledged topic.

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So the same functionality of DNS we are going to implement by using the host file.

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So in all the three system, we are going to make the entries in host file.

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What will be entry ip address 172.24.0.1 and then our domain name fully qualified domain

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name www.example1.com www, same entry for example2, example2.com example3.com that

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is entries we are going to make in the host file.

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So when the clients, what the clients do, it connects for getting the information about any

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domain name, it will connect to DNA server also hostname file also.

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So in hosts file it is going to find out, that mean if client is going to go to your host file and it is

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going to query www.example1.com, what the host files will return.

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It will return the ip address 172.24.0.1 in the case of example1.com, example2, and three also.

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that mean same functionality that is given by the DNS that can be and you can get that by making

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the host file.

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But if suppose there are hundreds system then making these entries in all the 100 system.

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This is difficult, if the number of systems are small so we can use this approach.

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So in our case, instead of using the DNS, we will be using this approach because our main purpose

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here in this course is learning about Apache Web server Single-Site then we are now discussing

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the virtual hosting first name based then IP based.

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So our main focus will be on Apache Web server.

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So we are getting that.

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We will be getting the functionality of the DNS by making changes in Hosts files and we have to make

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these changes in all the three systems.