IT 231

Spring 2018

Craig Miller

• Home
• Basic Information
• Grades and Policies
• Schedule

Weekly Notes

• Week 1
• Week 2
• Week 3
• Week 4
• Week 5
• Week 6
• Week 7
• Week 8
• Week 9
• Week 10

Assignments

• Assignment 1
• Assignment 2
• Assignment 3
• Assignment 4
• Assignment 5
• Assignment 6

Technical References

• Ruby on Rails Documentation
• Mozilla Technical Documents
• HTML Tag Reference
• CSS Property Reference
• JavaScript Guide

Web and Internet Terminology

We will review these terms in class. Here is a good online resource that explains how web servers work.

• Web browser (client) -- Used to view web documents stored as a file on your computer or access from a web server on the internet.
• Web server -- Hosts web pages. A web browser can access a web page from the web server on the internet.
• HTTP (Hyptertext Transit Protocol) -- communication protocol for accessing a web page from a web server.
• SSH (Secure Shell) -- secure protocol for communicating with a remote computer. We use the SSH File Transfer Client (SFTP) to transfer (upload) web HTML files from your computer to a Web server. FTP (File Transfer Protocol) is a less secure method for transferring a file.
• Host Name -- name given to a computer, often a web server (e.g. students.depaul.edu).
• TCP/IP (Tranmission Control Protocol / Internet Protocol) -- these are two levels of protocols that provide needed functionality for internet communications. Both SSH and HTTP use these protocols.
• IP Number -- this is a unique number that identifies a computer on the internet. DNS (Domain Name Server) provides a computer's host name when given its IP number.
• URL (Uniform Resource Locator) -- serves as the address for accessing a web page on the internet. Used for accessing other documents too.
• Client-side scripting -- the web browser performs all calculations
• Server-side scripting -- the web server performs the calculations whose results are then displayed by the web browser

Here is an example URL: http://condor.depaul.edu/~cmiller/myPage.html

• http specifies the protocol
• condor.depaul.edu specifies the host name of the web server
• ~cmiller/myPage.html specifies the location and file name on the web server