Web Fundamentals
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The document discusses various topics related to web fundamentals including: 1. The internet is a global network of smaller networks owned by no single entity, with information transferred via satellites, submarine cables, and other means. 2. The world wide web is a collection of interlinked hypertext documents accessed via URLs using the HTTP protocol. 3. A basic web request involves a browser looking up a domain name via DNS and sending an HTTP request to a web server, which returns a response. 4. Web development involves both server-side coding (e.g. PHP, ASP) and client-side coding (e.g. HTML, CSS, JavaScript).
Web Fundamentals
- 1. <html> <head> <Title> Web Fundamentals </Title>
- 2. This is not a presentation But more of a Discussion Maximum questions Maximum answers (if possible) You are allowed to sleep You will get a copy of these slides But slides are less important.
- 5. Agenda What is? Client Server Scripting Where we are now?
- 6. What is Internet? Internet is a global network of smaller networks. Internet is the largest network. It is owned by NOBODY Smaller network: 1-1000 computers Satellites, Submarine Optical cables The biggest name is Cisco
- 7. What is (the) Web? You mean World Wide Web? Collection of interlinked hypertext documents . That means Hyperlinked documents Hyperlinks? URL
- 8. HTTP? HTTP is an application level protocol for transferring data through WWW. Hyper Text Transfer Protocol HTTP 0.9 / 1.0 / 1.1 / 1.2 HTTP S (S for Secure ) HTML – Header , content . They say HTTP is stateless .
- 9. HTTP Error codes 1xx – Informational 2xx – Success 200 OK 3xx – Redirection 304 Not Modified 4xx – Client Error 404 Not Found 5xx – Server Error 500 Server Error
- 10. DNS? DNS is like post office Some post offices will be knowing some addresses DNS servers will have addresses like this www.google.com => 64.67.33.200 Multiple Name servers for reliability
- 11. Domain Name MUFIXCommunity.com mail.MUFIXCommunity.net http://www.mufixcommunity.net http://www.mufix community.net:80 http://mail.mufic.com:8086/inbox/index.jsp Port
- 12. A simple web request Browser Name Server Internet Web Server IIS, Apache, Lighttpd etc. BIND, PowerDNS, djbdns HTTP Response http://bookmarks.rediff.com/recent/ DNS Lookup bookmarks.rediff.com => 210.210.93.86
- 13. Multi Tier App? Database Server Application Server App Server - Biz Logic - Processing - Modifying Data J2EE, ASP.NET, PHP, RoR, Python Apache/TomCat, IIS, lightTPD MS SQL, MySQL, Oracle Web Server Internet Web Server - Static File Serving - Caching - Proxying Database Server - Storage of Data - Retrieval - Some Biz logic
- 14. Believe me 3 Tier Architecture is NOT MVC (Model View Controller) Multi tier is an architecture concept MVC is a software design concept
- 15. Believe me 3 Tier Architecture is NOT MVC (Model View Controller) Multi tier is an architecture concept MVC is a software design concept Excuse me. MVC ?!
- 16. MVC Presentation – View Logic – Controller Business Objects - Model
- 17. Server and Client side coding Web development comprises of server-side coding and client-side coding Server-side coding PHP ASP ASP.NET CGI and/or Perl J2EE Python, e.g. Django Ruby, e.g. Ruby on Rails Smalltalk e.g. Seaside ColdFusion Lotus Domino Client-side coding CSS HTML & DHTML XHTML Javascript Flash SilverLight
- 18. Career in Web development Server-side coding (coding) UI and UX (design) System Administration (networking) SEO and SEM (Marketing+analysis) Technical Support (Troubleshooting)