The document introduces the client server model used to access the internet. It discusses how a client like a web browser on a computer or phone connects to an internet server to request and receive webpages or other online resources. It explains that the client sends an HTTP request to the server's IP address, the server then returns the requested page if found or an error message if not found. The document also covers how the client server model revolutionized information transfer and some pros and cons of the model for organizations to consider.

1. The
Client Server Model
Imran, Ella, Christine and Annie

2. Introducing the Team
Imran Hafiz, Ella Banka, Christine Delp, and Annie Piotrowski

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

4. We'll learn
1. the process behind an
everyday experience
2. how CSM revolutionized the
transfer of information
3. the pros and cons of CSM
4. CSM and multimedia

5. And how this technology

6. Changed the
world.

7. The Client
1. phones, desktops, laptops, the computer in front of
you...
2. any device with software installed that access Interne
services
3. To access the WWW, the necessary software is a web
browser.

8. The Server
1. Powerful computer/computer cluster
that responds to your URL requests

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

10. 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 , it
returns it in an HTTP response
If not, server returns "404 Not Found"
3. Browser interprets and displays the content,
and then ends the connection.

11. And now for a brief intermission

12. Internet
History

13. Background
1. First mainframe computers did not use CSM.
2. It only became possible in the late 80's, early
90's.
3. This was when applications migrated from
minicomputers and mainframes with input/output
terminals to networks of desktop computers.

14. Multimedia

15. Multimedia
1. First Web Browsers only supported single-color
text, followed by browsers with support for colors
and font and later pictures.
2. Support for videos, sound, etc. handled
differently by various browsers.
3. Look at the file extension to see what files your
multimedia elements are stored in.
.png, .gif, .xml, etc.

16. Should your
start-up buy
a server?

17. PROS
1. Computers no longer size of small truck
2. Centralized location for files helps individual
computers run faster.
3. Can access files from any location
4. server manages common tasks like email and anti-virus
updates.

18. CONS
1. Contrast with peer to peer networks: several
computers which are connected to each other
2. P2P's are less expensive for small businesses.
3. 5. The server is a critical point of failure. If it goes
down, the entire network comes to a halt. Install
redundant drives in server or second server.

19. Test Your
Knowledge.