internet presentation
DESCRIPTION
What is the Internet for beginners!TRANSCRIPT
Talk Flow!
Introduction to the InternetBrief history
Explaining basic protocols
Naming on the net
HTML
Using search engines
Questions
What is the Internet?
A Network of Computer NetworksStarted as early as the 1960s
Built to work even if a large part of the network fails
Intranet is not the same as Internet
Decentralized Client – Server model
Supported by various gateways and high speed backbone connections.
Internet
Network
Internet
Internet
Network
T3Backbone
T3Backbone
T3Backbone
World Wide Web?
A part of the Internetwww1, www2 etc.,
Based on hypertext and hypertext transfer protocol (HTML & HTTP)
Supports multiple media - Multimedia
Interactive, dynamic HTML
Who owns the Internet?
The Internet Corporation for Assigned Names and Numbers (ICANN) oversees registrations.
InterNIC—central service to reserve domain names (lots of issues arising with “cyberquatting…”
Whois – domain name lookup
Brief History of the Internet
1960s - Department of Defense initiative ARPANET
1973 - ARPA launches the Internetting Project to explore the possibilities of linking networks
1980 – First Virus halts the Internet
1984 – DNS Introduced (Names rather than numbers)
1999 – Internet Banking
Internet Milestones
1975 - Robert Kahn & Vinton Cerf – TCP/IP
1991 : Hypertext browsing software is proposed by Tim Berners-Lee, the inventor of the World Wide Web.
1993 : Mosaic, the first navigation browser to make use of graphics and a point-and-click interface, is developed by Marc Andreessen.
2004 - IPv6 protocol standard
Services through the net
Major services:Email – Electronic MailFTP – File Transfer ProtocolGopherNewsgroupsTelnet – Remote sessionWAIS – Wide Area Information SystemWWW – World Wide Web
How to read an URL
http://www.crida.ernet.in/dcs/proposal.htm
http = the protocol
www = the host computer or server name
blast = third level domain
ncbl = second level domain
org = top level domain
sequence = directory name
virtual = file name
htm = file type / extension
Getting a Domain Name?
Top Domains:edu – Educational Institutionscom – Company / Commercial Organizationsorg – Non-profit Organizationsnet – Network, network of sitesmil – Military Installationsgov – Government sites
Sub Domains:in - Indiajp - Japanuk – United Kingdom
Identifying a PC on the Internet
IP Number220.226.64.35
10.15.3.20 (Intranet, Local IP)
To find your IP number on WindowsExecute ipconfig on your command prompt – XP
winipcgf - 98
Bandwidth
Speed of data transfer through the network
Access through:28.8 bps (bits per second) modem56.6 modemISDNT1/T3 – High speedCableDSL
Hypertext
Hypertext, a method of preparing text that allows readers to choose their own pathways through the material, is invented by Ted Nelson.
The underlined word represents a hyperlink that lets the reader click and jump to a new page.
Provides interactive browsing
Creating Web Documents
Editors: WYSIWYG• Frontpage, Dreamweaver or N-Vu
Text• Notepad
Word processors• MS - Word
Browsers and Specifications
Browser software allows us to view, hear, retrieve information created for the web
Internet Explorer, Netscape Navigator, Lynx
For design, you must check pages in both browsers, with different versions
Bioinformatics Resources
Databaseswww.ebi.ac.uk – EMBL/EBIwww.rcsb.org/pdb -PDB www.wwpdb.org - Worldwide Protein Data Bank
Genome Browserswww.ncbi.nlm.nih.gov/mapview - NCBI Map Viewerwww.bdgp.org/annot/apollo - Apollo Genome Browserhttp://maine.ebi.ac.uk:8000/services/cogent - Genome Tracking Database
Bioinformatics on the Internet
Bioinformatics Projects www.gg.caltech.edu/hbp - Human Brain Project
www.geneontology.org – Gene Ontology Consortium
http://tolweb.org/tree - Tree of Life Project
