LBSC 690 Session #2 FTP, "Hello World!" HTML Jimmy Lin The iSchool University of Maryland Wednesday, September 10, 2008 This work is licensed under a Creative.

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LBSC 690 Session #2 FTP, "Hello World!" HTML Jimmy Lin The iSchool University of Maryland Wednesday, September 10, 2008 This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States See for details

The iSchool University of Maryland Goals Gain a better understanding of networking Build you very own homepage!

Operating System

The iSchool University of Maryland Paths How do you specify the location of files on your hard drive? The folder metaphor Hierarchically nested directories Absolute vs. relative paths File extensions? /afs/wam.umd.edu/home/wam/j/i/jimmylin/home C:\Documents and Settings\Jimmy Lin\My Documents../pub..\Desktop

Source: Server (Web? File?)

Clients Source:

Port / Protocol

FTP

HTML

The iSchool University of Maryland Today’s Tutorial Your first HTML page Uploading your page to the Web server via FTP But first….

Source:

The iSchool University of Maryland “Hello World” HTML Hello World! Hello world! This is my first webpage! This is the header This is the actual content of the HTML document

The iSchool University of Maryland Uploading Your Page Connect to “terpconnect.umd.edu” Change directory to “/pub/USERID” Upload files Your very own home page at:

The iSchool University of Maryland Why Code HTML by Hand? The only way to learn is by doing WSIWYG editors… Often generate unreadable code Ties you down to that particular editor Cannot help you connect to backend databases Hand coding HTML allows you to have finer-grained control HTML is merely demonstrative of other important concepts: Structured documents Metadata

The iSchool University of Maryland Tips Edit files on your own machine, upload when you’re happy Save early, save often, just save! Reload browser File naming Don’t use spaces! Punctuation matters!

Details…

The iSchool University of Maryland Internet  Web Internet = collection of global networks Web = particular way of accessing information on the Internet Uses the HTTP protocol Other ways of using the Internet Usenet FTP (SMTP, POP, IMAP, etc.) Internet Relay Chat

The iSchool University of Maryland Intranets Intranet Gateways What are firewalls? Why can’t you do certain things behind firewalls?

The iSchool University of Maryland VPNs Intranet VPN = Virtual Private Network a secure private network over the public Internet Public Internet “leased line” Problem: How do you securely connect separate networks?

The iSchool University of Maryland Foundations Basic protocols for the Internet: TCP/IP (Transmission Control Protocol/Internet Protocol): basis for communication DNS (Domain Name Service): basis for naming computers on the network Protocol for the Web: HTTP (HyperText Transfer Protocol): protocol for transferring Web pages

The iSchool University of Maryland IP Address Every computer on the Internet is identified by a address IP address = 32 bit number, divided into four “octets” Example: go in your browser and type “ Are there enough IP addresses to go around? What is the difference between static and dynamic IP?

The iSchool University of Maryland Packet Routing (TCP/IP) DestinationNext Hop *.* *.* / *.*.* … (Much simplified) Routing table for

The iSchool University of Maryland Domain Name Service (DNS) “Domain names” improve usability Easier to remember than numeric IP addresses DNS coverts between names and numbers Written like a postal address: specific-to-general Each name server knows one level of names “Top level” name server knows.edu,.com,.mil, ….edu name server knows umd, mit, stanford, ….umd.edu name server knows ischool, wam, …

The iSchool University of Maryland Demo Play with various utilities at

The iSchool University of Maryland HyperText Transfer Protocol Send request Server response GET /path/file.html HTTP/1.0 From: User-Agent: HTTPTool/1.0 HTTP/ OK Date: Fri, 31 Dec :59:59 GMT Content-Type: text/html Content-Length: 1354 Happy New Millennium! …

The iSchool University of Maryland Tell me what happens… From the moment you click on “check messages” to the moment you start reading your From the moment you click “send” to the moment the other party receives the From the moment you type a URL and hit “enter” to the moment you see the Web page