CS1001 Lecture 8.

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Presentation transcript:

CS1001 Lecture 8

Overview Internet Services Security Markup Languages HTML

Goals Understand Internet Services Examine network security issues What is a “Markup Language”? Learn Basic HTML

Assignments Brookshear: Ch 8.2, 8.3 (Read) Read HTML Primers http://www.columbia.edu/acis/webdev/ http://www.davesite.com/webstation/html/ http://www.w3.org/MarkUp/ Primer on the Semantic Web http://www.scientificamerican.com/article.cfm?articleID=00048144-10D2-1C70-84A9809EC588EF21&catID=2 Read linked documents on these slides (slides will be posted in courseworks)

Network Protocols A Protocol is a means for two parties to exchange data. Contains ways of sending/receiving/acknowledging data, error recovery, ability to switch context Example: HTTP, SMTP

Figure 3.18: The Internet software layers

Figure 3.19: Following a message through the Internet

Figure 3.19: Following a message through the Internet (continued)

Protocols There are distinct protocols at each of the Link, Network, Transport, Application layers Protocols establish standards for exchanging binary data Protocols can be optimized for each task (some protocols are good for transferring large files… others are better for transferring streaming video)

Figure 3.20: Choosing between TCP and UDP

Figure 3.17: Package-shipping example

Figure 3.13: A typical URL

Figure 3.14: A simple Web page expressed in HTML

The Internet HTTP (Hypertext Transfer Protocol) is sent over TCP/IP (Transmission Control Protocol/Internet Protocol). HTTP is a means of efficiently requesting and sending HTML pages/graphics. TCP/IP is generic and operates at the lower “Transport” layer

Core Internet Services DNS – Translates Names to numerical IP Addresses IP Addresses consist of 4 “octets” of data (a number from 0 to 255)

Markup Languages A markup language exists only in the context of some other language. A markup language surrounds and “marks up” terms in an existing language. HTML “marks up” human languages with structural and presentational information Examples: HTML, XML, LaTeX

HTML Hypertext Markup Language “Hyper” => Text in multiple dimensions International Standard (W3C) Describes the structure of information (not really the presentation of it)