CIS131 Chapter 02

From Cis131

Jump to: navigation, search
Home | Chapters | Homework | Grades | Final Project | Podcast | Forums | Syllabus | Forum Policy | Assignment Policy
Jump to Chapter: 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18


Summary - A Network's Reason for Existence

In this chapter we will look at some of the categories of network-based application and what level of knowledge the user needs in regards to the their network ability. Then we will look at how a company gains access to the Internet.

Using the Network by Accident

In a LAN a user may be using the network without even knowing it. In a Windows environment with Microsoft Office, users save their data to their My Documents folder. The server guy can configure the computers to have My Documents redirect to the users home folder on the server. This way the data is stored on the server where it can be centrally backed up. By doing this the user didn't have to change their working habits to use the network. When the user saves or opens a file that resides in My Documents they are using the network by accident. The above example also demonstrates the transparent use of networks to the users. Since the LAN speeds are so high the data is copied to the user's computer so fast the user doesn't realize the file they just opened was copied to it from the server. Another example is when a user prints, the user my know that the server is not hooked to their computer but as far as they are concerned they can hit print in their application and it comes out on the printer. They are using the network without doing something different.

Using the Network on Purpose

There are times when you use the network on purpose. When you get on the internet you know you are on a global network, that the data you are looking for isn't on your computer. You have to go "out" to get it, and that path "out" is through your network.

Web Browsing

When you browse the Internet you use a web browser, to connect to a web server to view a company's website. The web browser is a program that is installed on your computer. When you open the web browser it connects to its preconfigured home page. The home page is a web page stored on a web server on the Internet. The web server waits for computer to request information, when your web browser requests information the web server returns it. Your web browser receives the data and presents it to you in a user friendly manner. A URL (Universal Resource Locator) is used to uniquely identify a particular webpage.

Electronic Mail (E-Mail)

E-Mail is one of the most popular forms of communication in use today. You can send e-mail to anyone on the Internet providing you have their e-mail address. The way e-mail works is as following:

  • You compose an email on your computer, type in the e-mail address of the desired recipient in the To field and include a subject, then press send.
  • The mail goes from your computer to your mail server, this can be your ISP or another server. If your e-mail address is then it goes to the yahoo mail servers, if your address is then it goes to the gmail mail servers.
  • The mail server sends the e-mail to the destination mail server, if the addressee's address is a address it is sent to msn's mail servers.
  • Once the receiving mail server gets the mail it will place it in the recipients mailbox. (Also at this point the receiving server will probably scan the mail to make sure it is virus free and not SPAM)
  • The next time the recipient checks their e-mail the message will be sent to their computer.

Notice, when the mail is sent it is not required that the recipient be online to receive the message.

Downloading and Transferring Files

Download - retrieving a copy of a file from a source. Upload - coping a file from your computer to another computer so others can access it.

Personal tools