World Wide Web

 comprises software (Web server and browser) and data (Web sites).

 Internet Protocol (IP) Addresses:

-  Every node has a unique numeric address

-  Form: 32-bit binary number

-  New standard, IPv6, has 128 bits (1998)

-  Organizations are assigned groups of IPs for their computers

-  Domain names

-  Form: host-name. domain-names

-  First domain is the smallest (Google)

-  Last domain specifies the type of organization (.com)

-  Fully qualified domain name - the host name and all of the domain names

-  DNS servers - convert fully qualified domain names to IPs

HTTP:

Hypertext Transfer Protocol (HTTP) is the communication protocol used by the Internet to transfer hypertext documents.

 A protocol to transfer hypertext requests and information between servers and browsers

Hypertext is text, displayed on a computer, with references (hyperlinks) to

 other text that the reader can immediately follow, usually by a mouse HTTP is behind every request for a web document or graph, every click of a hypertext link, and every submission of a form.

HTTP specifies how clients request data, and how servers respond to these requests.

The client makes a request for a given page and the server is responsible for finding it and returning it to the clie

The browser connects and requests a page from the server.

The server reads the page from the file system and sends it to the client and then terminates the connection

HTTP Transactions