Chapter 3Computer Networking

The College of Saint RoseCIS 111 – Introduction to Computer ScienceDavid Goldschmidt, Ph.D.

from Fluency with Information Technology, 4th edition by Lawrence Snyder, Addison-Wesley, 2010, ISBN 0-13-609182-2

Are you connected?

The Internet (1969) is a network that’s Global Decentralized Redundant Made up of many different types of

machines

What do we use the Internet for? How many machines make up the

Internet?

Browsing the Web

How do we communicate?

Synchronously Sender and receiver are active

at the same time Sending and receiving occur

(almost) simultaneously

Asynchronously Sending and receiving occur

at different times

Client/server communication

One-to-many relationships

Hostnames and IP addresses

Finding a domain

Welcome to my domain

Getting your message across

Messages are divided into individual packets

From point A to point B

Going wireless

The World Wide Web

Internet revolution (1990s/2000s)

Sir Tim Berners-Lee

Weaving the Web

The World Wide Web (or just Web) is: Global Decentralized Redundant (sometimes) Made up of Web pages

and interactive Web services

How many Web pages are on the Web?

Building blocks of the Web Three key building blocks of the Web:

Uniform Resource Locator (URL) HyperText Transfer Protocol (HTTP) HyperText Transfer Markup

Language (HTML)

The original intent of the Webwas to provide a networkedmedium to share information

Know IT

Read Chapter 3

Do all of the Multiple Choice and Short Answer questions