We may have a city here and a city here and a city

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connects devices all around the world. We may have a city here and a city here and a city here, and they all share a common way of connecting so that they can route signals between each other. At each spot, you will have one or more ISPs, which are Internet Service Providers. ISPs don't manage the main part of the Internet network. Instead, they manage an access point to the Internet. If you think of the Internet as a big freeway, then they would be the entity that manages the on-ramp to the freeway. They're responsible for building the on-ramp and keeping it maintained and open, but they're not responsible for the whole Internet itself. The ISP is responsible for allowing both individual users, as well as companies with large networks, to connect to the Internet itself. For example, you could contract with an ISP to connect your network to the Internet. In this scenario, there's typically a security boundary that separates your network from the public Internet network. You may have devices on your network that access network servers, such as web servers and email servers. They're connected to the Internet, but other computers that are on theInternet cannot come in and contact devices within your network. As you can see, this creates a division of sorts between networks. Public networks share all devices and they're freely available. On the other hand, devices on a private network can access public network devices, but they themselvescan only be accessed by other devices within the private network. There may be exceptions. For example, in this particular network we might have a particular server that we do want to make available to the public, such as a server that hosts a website for my organization. In order to do this, I would actually need to place my web server outside of this security boundary so that devices in other locations can reach this website through the Internet. In essence, when I do this I've made part of my network public or created a small public network, if you will, that is connected to the larger Internet. Intranet 8:42-9:28 A related term that you might hear from time to time is that of intranet. An intranet is really kind of like a miniature Internet. An intranet is a private network, not a public one, but it uses many of the same technologies that are used on the Internet. This intranet may or may not be connected to the public Internet. For example, we could have an email server within our private network so that only people within my private network can access it, even though my network is actually connected to the Internet. This way I'm using Internet technology on my local private network. Again, this security boundary here would prevent devices on the Internet from accessing the devices within my intranet. Extranet 9:29-10:38 Another term you might hear is that of extranet. An extranet essentially is an intranet that is made partially available to entities outside of your organization. For example, let's say we have a companyhere and it's connected to the Internet. This company has a partner company in another location and we need to take some of the information within our intranet and make it available through theInternet to that partner organization. To
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