The

Imran, Ella, Christine and Annie

Client Server Model

Introducing the Team

Imran Hafiz, Ella Banka, Christine Delp, and Annie Piotrowski

We know

1. How to type "google.com" into the addressbar. 2. We communicate with Internet users acrossthe world within milliseconds. 3. The Client Server Model makes this possible.

1. the process behind aneveryday experience2. how CSM revolutionized thetransfer of information3. the pros and cons of CSM4. CSM and multimedia

We'll learn

And how this technology

Changed theworld.

The Client

1. phones, desktops, laptops, the computer in front ofyou... 2. any device with software installed that access Interneservices3. To access the WWW, the necessary software is a webbrowser.

The Server

1. Powerful computer/computer clusterthat responds to your URL requests

The Process: 1

1. Type <sites.duke.edu>2. Browser divides URL into pieces.3. Browser uses the DNS system to convert theserver’s user-friendly name into a server’s IP address.4. Browser makes a connection to the server’s IPaddress.5. Server accepts the connection.

The Process: 2

1. Browser sends an HTTP request asking for a copy of the HTML document stored at the URL/IP address. 2. if the server can find the requested page , itreturns it in an HTTP responseIf not, server returns "404 Not Found"3. Browser interprets and displays the content,and then ends the connection.

And now for a brief intermission

InternetHistory

1. First mainframe computers did not use CSM. 2. It only became possible in the late 80's, early90's.3. This was when applications migrated fromminicomputers and mainframes with input/outputterminals to networks of desktop computers.

Background

Multimedia

Multimedia1. First Web Browsers only supported single-colortext, followed by browsers with support for colorsand font and later pictures. 2. Support for videos, sound, etc. handleddifferently by various browsers.3. Look at the file extension to see what files yourmultimedia elements are stored in. .png, .gif, .xml, etc.

Should yourstart-up buy

a server?

PROS1. Computers no longer size of small truck2. Centralized location for files helps individualcomputers run faster. 3. Can access files from any location4. server manages common tasks like email and anti-virus updates.

CONS1. Contrast with peer to peer networks: severalcomputers which are connected to each other2. P2P's are less expensive for small businesses. 3. 5. The server is a critical point of failure. If it goesdown, the entire network comes to a halt. Installredundant drives in server or second server.

Test YourKnowledge.