Session I (part 2): Internet Basics


Basic Internet Applications
First of all, the Internet traditionally has been comprised of three main applications (even though there are a lot more), the first one being e-mail. I think most of you have heard of e-mail.

The second is FTP, or File Transfer Protocol. This protocol is what allows you to transfer one type of file from one computer on the internet to files on your local computer.

The third application is Telnet. Telnet is the process of connecting remotely to another computer, logging in to it and making use of its information and resources.

IP Addresses
Another thing that is important to understand about the internet is the IP address. The slide you are seeing now has an example of an IP address Every computer on the Internet has an IP address and even though when you are dialing up you may get a different IP address when you are on the Internet That's important because you cannot communicate without having an IP address assigned to you.

Internet Domains
A little bit about domain names: Every IP address has a corresponding domain name. The reason we have domain names rather than just IP address is because we remember names better than we remember numbers, so all IP numbers are mapped to a domain name. Every Internet host has or resides within a domain name. All the domain names are controlled by and organization called the Network Information Center or Internic.

Anatomy of a Domain Name
The slide that you are seeing now is an example of a domain name on the left hand side you will see a host name actually the name of the computer in the middle, Fort Lewis is known as a zone name and on the right hand side is a high level domain So Fort Lewis' domain name is fortlewis.edu. If you were a commercial organization, you might be something like cnn.com or Cocacola.com. Not every computer has a host name, many computers do, but there are many of them that don't. I would say that the majority do not have a host name.

High Level Domains
A few words about high level domains...I have mentioned There are several of these (see slide for host names...?) There has been some talk about using more high level domains than this but that is still under discussion at this point in time.

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