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A WAN is a network of computers that are in the same general physical location, usually within a building or a campus. 

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The Internet is a collection of huge corporate networks that agree to all intercommunicate with each other at the NAPs. In this way, every computer on the Internet connects to every other.

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 DNS purpose is vital, as it helps convert easy-to-understand domain names like "howstuffworks.com" into an Internet Protocol (IP) address, such as 70.42.251.42 that computers use to identify each other on the network. It is, in short, a system of matching names with numbers.

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Each packet's header will contain the proper protocols, the originating address (the IP address of your computer), the destination address (the IP address of the computer where you are sending the e-mail) and the packet number (1, 2, 3 or 4 since there are 4 packets).

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Much of the work to get a message from one computer to another is done by routers, because they're the crucial devices that let messages flow within networks, rather than between networks.

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 Footer typically contains a couple of bits that tell the receiving device that it has reached the point of destination. 

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Other  types of hardware that support the Internet including routers, servers, cell phone towers and other devices are called clients.

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The protocols provide both the method and a common language for machines to use to transmit data.

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Because most people have trouble remembering the strings of numbers that make up IP addresses, and because IP addresses sometimes need to change, all servers on the Internet also have machine-readable names, called domain names.

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Voice over Internet Protocol, is a method for taking analog audio signals, like the kind you hear when you talk on the phone, and turning them into digital data that can be transmitted over the Internet.