CSE394F
Computer Networking for Engineers
Computer
Networking
for
Engineers
Lecture #21
Jeffrey Miller, Ph.D.
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Computer Networking for Engineers Lecture 21: The World Wide Web - Prof. Jeffrey A. Miller, Study notes of Engineering
An overview of the world wide web (www), its history, architecture, and the process of web page retrieval. The document also covers uniform resource locators (urls), various web languages, and dynamic web pages. It includes a brief mention of http methods, status codes, and message headers.
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2009/2010
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CSE394F
Computer Networking for EngineersComputer Networking for Engineers
Lecture
Jeffrey Miller, Ph.D.
Outline
• Chapter 7.3-7.5•^
All images with white backgrounds are from Andrew
g^
g
Tanenbaum’s Computer Networks, 4
th^
Edition, Prentice
Hall, 2003.
WWW Architecture
• The WWW uses a client/server architecture
Web Page Retrieval
•^
Browser determines the URL to fetch
-^
Browser asks DNS for the IP address of theh^
/d
i^
bi
i
hostname/domain name combination
-^
DNS replies with the IP address
-^
Browser makes a TCP connection to port 80 (by default) of
-^
Browser makes a TCP connection to port 80 (by default) ofthat IP address
-^
Browser sends a request for the file
-^
Servers sends the contents of the file
-^
TCP connection is released
-^
Browser displays the file
-^
Browser fetches and displays all the images
Languages
-^
HTML (Hypertext Markup Language)
-^
XML (eXtensible Markup Language)
(^
p
g
g )
-^
XSL (eXtensible Stylesheet Language)
-^
XHTML (eXtended Hypertext Markup Language)
(^
yp
p
g
g )
-^
CGI (Common Gateway Interface)
-^
PHP (PHP: Hypertext Preprocessor)PHP (PHP: Hypertext Preprocessor)
-^
JSP (Java Server Page)
-^
ASP (Active Server Page)
-^